Overall Green Tropical Cyclone alert for SURIGAE-21 in Japan, Philippines, Palau from 13 Apr 2021 12:00 UTC to 24 Apr 2021 18:00 UTC

GDACS is a cooperation framework between the United Nations, the European Commission and disaster managers worldwide to improve alerts, information exchange and coordination in the first phase after major sudden-onset disasters.

Overall Green alert Tropical Cyclone for SURIGAE-21

in Japan, Philippines, Palau

click on

to select bulletin time

Meteorological source:

GDACS JTWC

Impact Single TC

GFS
HWRF
ECMWF

Impact based on all weather systems in the area

Impact

Tropical Cyclone SURIGAE-21 can have a low humanitarian impact based on the maximum sustained wind speed,exposed population and vulnerability.

Meteorological source	ECMWF
Exposed countries	Palau
Exposed population	No people in Category 1 or higher
Maximum wind speed	68 km/h
Maximum storm surge	0.5 m (14 Apr 13:30 UTC)
Vulnerability	Medium (Palau)

GDACS Score

GDACS alert score for Tropical Cyclones is 0.5 (GREEN Alert), 1.5 (ORANGE Alert), 2.5 (RED Alert)
For more info on GDACS alert score click here.

	Wind	Storm surge	Rainfall	GDACS score
ECMWF Current	68 km/h	0.5 m	202 mm	0.5
ECMWF Overall	212 km/h	0.6 m	1088 mm	0.5
Maximum winds, storm surge, rainfall (Current: over the next 72 h, Overall: entire TC track)

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Wind

212 km/h

Up to Few people can be affected by wind speeds of Tropical Storm strength or above

Wind exposed population - AoIs

Estimations based on the bulletin of 14 Apr 2021 12:00 UTC

Category	Country	Population
Tropical Storm	Palau	735

See TC classification SSHS

Wind Impact Timeline

people affected <=10000

10000< people affected <=100000

people affected >100000

N°	Date (UTC)	Max Winds (km/h)	Pop in Cat. 1 or higher	TS	Cat. 1	Cat. 2	Cat. 3	Cat. 4	Cat. 5	Countries
1	13 Apr 2021 00:00	58	-	-	-	-	-	-	-
2	13 Apr 2021 12:00	72	-	-	-	-	-	-	-
3	14 Apr 2021 00:00	72	-	-	-	-	-	-	-
4	14 Apr 2021 12:00	205	-		-	-	-	-	-	Palau

Download:

Impact estimation for the next 72h

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Rainfall

Rain exposed population - AoIs

Estimations based on the bulletin of 14 Apr 2021 12:00 UTC

Level	Country	Population
250-500 mm	Palau	203
100-250 mm	Philippines, Federated States of Micronesia, Palau	64,834	+
	Philippines	33,678
	Federated States of Micronesia	10,664
	Palau	20,492
50-100 mm	Taiwan, Japan, Philippines, Palau	1,231,173	+
	Taiwan	8,006
	Japan	43,008
	Philippines	1,179,819
	Palau	340

Rain Impact Timeline

people affected <=10000

10000< people affected <=100000

people affected >100000

N°	Date (UTC)	Max Rainfall (mm)	Pop >100mm or higher	50-100	100-250	250-500	500-750	750-1000	>1000	Countries
1	13 Apr 2021 00:00	101	-		-	-	-	-	-	Philippines
2	13 Apr 2021 12:00	422	-	-	-	-	-	-	-
3	14 Apr 2021 00:00	331	-		-	-	-	-	-	Philippines
4	14 Apr 2021 12:00	690	70 thousand				-	-	-	Taiwan, Japan, Philippines, Federated States of Micronesia, Palau

Impact estimation for the next 72h

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StormSurge

0.5 m

The maximum Storm surge height is 0.5m in Amontay, Philippines. This height is estimated for 14 Apr 2021 13:30 UTC .

The JRC has developed an experimental global storm surge model, which is run after each advisory issued by the regional tropical cyclone centres. The calculations are published about 20 minutes after a new advisory is detected by GDACS. The calculations identify the populated places affected by storm surge up to three days in advance, using the forecasted track. When forecasts change, the associated storm surge changes too and alert levels may go up or down. All links, data, statistics and maps refer to the latest available calculation. If the calculation for the last advisory is not completed, the latest available calculation is shown.

Storm Surge Exposed population - AoIs

Storm Surge Exposed locations

Calculation based on the bulletin of 14 Apr 2021 12:00 UTC

Alert	Date (UTC)	Name	Country	Storm surge height (m)
	14 Apr 2021 13:30	Amontay	Philippines	0.5
	14 Apr 2021 13:30	Mascarina	Philippines	0.5
	14 Apr 2021 13:30	Apad	Philippines	0.5
	14 Apr 2021 13:30	Gumaca	Philippines	0.5
	14 Apr 2021 13:30	Argosino	Philippines	0.5
	14 Apr 2021 13:30	Lopez	Philippines	0.5
	14 Apr 2021 13:30	Calauag	Philippines	0.5
	14 Apr 2021 13:30	Apad Lutao	Philippines	0.5
	14 Apr 2021 18:45	Pag-aguasan	Philippines	0.4
	14 Apr 2021 18:45	Concepcion	Philippines	0.4
	14 Apr 2021 18:45	Alabat	Philippines	0.4
	14 Apr 2021 13:30	Calaguikhik	Philippines	0.4
	14 Apr 2021 13:30	Talingting	Philippines	0.4
	14 Apr 2021 13:30	Atimonan	Philippines	0.4
	14 Apr 2021 19:00	Cabag	Philippines	0.4
	14 Apr 2021 13:30	Perez	Philippines	0.4
	14 Apr 2021 13:30	Cavilla	Philippines	0.4
	14 Apr 2021 13:30	San Jose	Philippines	0.4
	14 Apr 2021 18:00	Surigao	Philippines	0.4
	14 Apr 2021 18:00	Buenavista	Philippines	0.4
	14 Apr 2021 18:00	Tagana-an	Philippines	0.4
	14 Apr 2021 18:00	Placer	Philippines	0.4
	14 Apr 2021 18:00	Matas	Philippines	0.4
	14 Apr 2021 18:00	Cadgianao	Philippines	0.4
	14 Apr 2021 18:00	Talavera	Philippines	0.4
	14 Apr 2021 13:30	Calamias	Philippines	0.3
	14 Apr 2021 13:30	Mauban	Philippines	0.3
	14 Apr 2021 19:15	Polillo	Philippines	0.3
	14 Apr 2021 19:15	Bisliang	Philippines	0.3
	14 Apr 2021 19:15	Abucay	Philippines	0.3
	14 Apr 2021 19:15	Calutcot	Philippines	0.3
	14 Apr 2021 19:15	Patnanongan	Philippines	0.3
	14 Apr 2021 23:45	Kinabutan	Philippines	0.3
	14 Apr 2021 23:45	Gigaquit	Philippines	0.3
	14 Apr 2021 23:45	Claver	Philippines	0.3
	14 Apr 2021 14:00	Cabungalunan	Philippines	0.3
	14 Apr 2021 13:30	Caluekan	Philippines	0.3
	14 Apr 2021 13:15	Hermosa	Philippines	0.3
	14 Apr 2021 13:15	Abucay	Philippines	0.3
	14 Apr 2021 13:15	Orani	Philippines	0.3
	14 Apr 2021 13:15	Samal	Philippines	0.3
	14 Apr 2021 13:15	Balanga	Philippines	0.3
	14 Apr 2021 13:15	Pilar	Philippines	0.3
	14 Apr 2021 13:15	Orion	Philippines	0.3
	14 Apr 2021 23:00	Urbistondo	Philippines	0.3
	14 Apr 2021 23:00	Taganito	Philippines	0.3
	14 Apr 2021 19:30	Pangas	Philippines	0.3
	14 Apr 2021 19:30	Binauangan	Philippines	0.3
	14 Apr 2021 19:30	Mactang	Philippines	0.3
	14 Apr 2021 23:00	Adlay	Philippines	0.3
	14 Apr 2021 23:00	Pamosaingan	Philippines	0.3
	14 Apr 2021 23:00	Socorro	Philippines	0.3
	14 Apr 2021 19:15	Labayat	Philippines	0.3
	14 Apr 2021 23:30	Cabugao	Philippines	0.3
	14 Apr 2021 23:30	Dapa	Philippines	0.3
	14 Apr 2021 13:15	Capalonga	Philippines	0.3
	14 Apr 2021 13:15	Alayao	Philippines	0.3
	14 Apr 2021 23:30	Numancia	Philippines	0.3
	14 Apr 2021 13:15	Pamarauan	Philippines	0.2
	14 Apr 2021 13:30	Jomalig	Philippines	0.2
	14 Apr 2021 13:15	Meycauayan	Philippines	0.2
	14 Apr 2021 13:15	Tanza	Philippines	0.2
	14 Apr 2021 13:45	Real	Philippines	0.2
	14 Apr 2021 23:30	San Benito	Philippines	0.2
	14 Apr 2021 13:30	Infanta	Philippines	0.2
	14 Apr 2021 13:15	Limay	Philippines	0.2
	14 Apr 2021 13:00	Tinajeros	Philippines	0.2
	14 Apr 2021 13:00	Caloocan	Philippines	0.2
	14 Apr 2021 13:00	Manila	Philippines	0.2
	14 Apr 2021 23:30	Sapao	Philippines	0.2
	14 Apr 2021 23:30	Beilon	Philippines	0.2
	14 Apr 2021 23:30	Burgos	Philippines	0.2
	14 Apr 2021 23:15	Layagoang	Philippines	0.2
	14 Apr 2021 13:15	Cavite	Philippines	0.2
	14 Apr 2021 13:00	Amaya	Philippines	0.2
	14 Apr 2021 13:00	Tehero	Philippines	0.2
	14 Apr 2021 13:00	Tanza	Philippines	0.2
	14 Apr 2021 13:00	Binakayan	Philippines	0.2
	14 Apr 2021 13:00	General Trias	Philippines	0.2
	14 Apr 2021 13:00	Imus	Philippines	0.2
	14 Apr 2021 13:30	Jose Panganiban	Philippines	0.2
	14 Apr 2021 19:00	Binibitinan	Philippines	0.2
	14 Apr 2021 13:15	Cabcaben	Philippines	0.2
	14 Apr 2021 19:15	Paracale	Philippines	0.2
	14 Apr 2021 23:30	Alegria	Philippines	0.2
	14 Apr 2021 21:15	Paet	Philippines	0.2
	14 Apr 2021 21:15	Rizal	Philippines	0.2
	14 Apr 2021 21:15	Daram	Philippines	0.2
	14 Apr 2021 21:15	Bagacay	Philippines	0.2
	14 Apr 2021 21:15	Guintampilan	Philippines	0.2
	14 Apr 2021 21:15	Tatabunan	Philippines	0.2
	14 Apr 2021 21:15	Macalonud	Philippines	0.2
	14 Apr 2021 21:15	Mualbual	Philippines	0.2
	14 Apr 2021 21:15	Catbalogan	Philippines	0.2
	14 Apr 2021 21:15	San Andres	Philippines	0.2
	14 Apr 2021 21:15	Narombacan	Philippines	0.2
	14 Apr 2021 21:15	Bangon	Philippines	0.2
	14 Apr 2021 21:15	Igot	Philippines	0.2
	14 Apr 2021 21:15	Wright	Philippines	0.2
	14 Apr 2021 21:15	Calbiga	Philippines	0.2
	14 Apr 2021 21:15	Salay	Philippines	0.2
	14 Apr 2021 21:15	Pequit	Philippines	0.2
	14 Apr 2021 21:15	Pabanong	Philippines	0.2
	14 Apr 2021 21:15	Hinabangan	Philippines	0.2
	14 Apr 2021 23:30	Pagauanen	Philippines	0.2
	14 Apr 2021 23:30	Binaluan	Philippines	0.2
	14 Apr 2021 23:30	Liminancong	Philippines	0.2
	14 Apr 2021 23:30	Bebeladan	Philippines	0.2
	14 Apr 2021 23:15	Valencia	Philippines	0.2
	14 Apr 2021 21:30	Barceloneta	Philippines	0.2
	14 Apr 2021 21:30	Mandao	Philippines	0.2
	14 Apr 2021 21:30	Barana	Philippines	0.2
	14 Apr 2021 21:30	Fundado	Philippines	0.2
	14 Apr 2021 21:30	Karigsa	Philippines	0.2
	14 Apr 2021 21:30	Calabanga	Philippines	0.2
	14 Apr 2021 23:30	Calmung	Philippines	0.2
	14 Apr 2021 23:30	El Nido	Philippines	0.2
	14 Apr 2021 23:30	Camago	Philippines	0.2
	14 Apr 2021 23:30	Manlalec	Philippines	0.2
	14 Apr 2021 21:00	Santa Rita	Philippines	0.2
	14 Apr 2021 13:15	Mariveles	Philippines	0.2
	14 Apr 2021 21:45	Magtang	Philippines	0.2
	14 Apr 2021 21:45	Lamon	Philippines	0.2
	14 Apr 2021 21:45	Union	Philippines	0.2
	14 Apr 2021 21:45	Tinambac	Philippines	0.2
	14 Apr 2021 21:45	Gongonan	Philippines	0.2
	14 Apr 2021 18:00	San Isidro	Philippines	0.2
	14 Apr 2021 18:00	Pilar	Philippines	0.2
	14 Apr 2021 18:00	Caridad	Philippines	0.2
	14 Apr 2021 20:45	Capitun-an	Philippines	0.2
	14 Apr 2021 13:15	Vinzons	Philippines	0.1
	14 Apr 2021 13:15	Banacboc	Philippines	0.1
	14 Apr 2021 13:15	Talaga	Philippines	0.1
	14 Apr 2021 23:15	San Jose	Philippines	0.1
	14 Apr 2021 13:30	Panukulan	Philippines	0.1
	14 Apr 2021 13:30	Ngalan	Philippines	0.1
	14 Apr 2021 22:15	Bolinao	Philippines	0.1
	14 Apr 2021 22:15	Zaragoza	Philippines	0.1
	14 Apr 2021 22:15	Pamaoran	Philippines	0.1
	14 Apr 2021 22:15	Pilar	Philippines	0.1
	14 Apr 2021 22:15	Anda	Philippines	0.1
	14 Apr 2021 22:15	Dolaoan	Philippines	0.1
	14 Apr 2021 22:15	Alaminos	Philippines	0.1
	14 Apr 2021 22:15	Lucap	Philippines	0.1
	14 Apr 2021 22:15	Santiago	Philippines	0.1
	14 Apr 2021 22:15	Tondol	Philippines	0.1
	14 Apr 2021 22:15	Panasgasan	Philippines	0.1
	14 Apr 2021 22:15	Nabaul	Philippines	0.1
	14 Apr 2021 22:15	Capantolan	Philippines	0.1
	14 Apr 2021 22:15	Mangas	Philippines	0.1
	14 Apr 2021 21:30	Miguel	Philippines	0.1
	14 Apr 2021 21:30	Tandoc	Philippines	0.1
	14 Apr 2021 21:30	San Vicente	Philippines	0.1
	14 Apr 2021 13:00	Maragondon	Philippines	0.1
	14 Apr 2021 13:00	Naic	Philippines	0.1
	14 Apr 2021 13:00	Daet	Philippines	0.1
	14 Apr 2021 13:00	Tagontong	Philippines	0.1
	14 Apr 2021 13:00	Mambongalon	Philippines	0.1
	14 Apr 2021 17:15	Lamitan	Philippines	0.1
	14 Apr 2021 17:15	Bojelebung	Philippines	0.1
	14 Apr 2021 17:15	Kandiis	Philippines	0.1
	14 Apr 2021 22:15	Lingayen	Philippines	0.1
	14 Apr 2021 22:15	Labangan	Philippines	0.1
	14 Apr 2021 22:15	Damaloguen	Philippines	0.1
	14 Apr 2021 22:15	Bugallon	Philippines	0.1
	14 Apr 2021 22:15	Baloboc	Philippines	0.1
	14 Apr 2021 22:15	Maniboc	Philippines	0.1
	14 Apr 2021 22:15	Binmale	Philippines	0.1
	14 Apr 2021 22:15	Canaoalan	Philippines	0.1
	14 Apr 2021 22:15	Carael	Philippines	0.1
	14 Apr 2021 22:15	Dagupan	Philippines	0.1
	14 Apr 2021 22:15	Bateng	Philippines	0.1
	14 Apr 2021 22:15	Batang	Philippines	0.1
	14 Apr 2021 22:15	Damipac	Philippines	0.1
	14 Apr 2021 22:15	Ugnisan	Philippines	0.1
	14 Apr 2021 22:15	Bonongan	Philippines	0.1
	14 Apr 2021 22:15	Carigmalan	Philippines	0.1
	14 Apr 2021 22:15	Molpok	Philippines	0.1
	14 Apr 2021 22:15	Culion	Philippines	0.1
	14 Apr 2021 22:15	Bataguanan	Philippines	0.1
	14 Apr 2021 22:15	Bulalacao	Philippines	0.1
	14 Apr 2021 22:15	Bancuan	Philippines	0.1
	14 Apr 2021 22:15	Coron	Philippines	0.1
	14 Apr 2021 22:45	Barotuan	Philippines	0.1
	14 Apr 2021 22:45	Oton	Philippines	0.1
	14 Apr 2021 22:45	Dipnay	Philippines	0.1
	14 Apr 2021 22:15	Lucero	Philippines	0.1
	14 Apr 2021 22:00	Alacan	Philippines	0.1
	14 Apr 2021 21:15	Bislig	Philippines	0.1
	14 Apr 2021 21:15	Mangagoy	Philippines	0.1
	14 Apr 2021 21:15	Otiela	Philippines	0.1
	14 Apr 2021 21:15	Lingig	Philippines	0.1
	14 Apr 2021 21:15	Lawigan	Philippines	0.1
	14 Apr 2021 21:15	Barcelona	Philippines	0.1
	14 Apr 2021 20:00	Limao	Philippines	0.1
	14 Apr 2021 20:00	Dadaotan	Philippines	0.1
	14 Apr 2021 20:00	Basao	Philippines	0.1
	14 Apr 2021 20:00	Santa Cruz	Philippines	0.1
	14 Apr 2021 20:00	Samal	Philippines	0.1
	14 Apr 2021 20:00	Kaputian	Philippines	0.1
	14 Apr 2021 20:00	Tagbitanag	Philippines	0.1
	14 Apr 2021 20:00	Del Monte	Philippines	0.1
	14 Apr 2021 20:00	Pangubatan	Philippines	0.1
	14 Apr 2021 20:00	Aumbay	Philippines	0.1
	14 Apr 2021 20:00	Ligtong	Philippines	0.1
	14 Apr 2021 20:00	Matiao	Philippines	0.1
	14 Apr 2021 20:00	Ayon	Philippines	0.1
	14 Apr 2021 20:00	Tambungon	Philippines	0.1
	14 Apr 2021 20:00	Pintatagan	Philippines	0.1
	14 Apr 2021 17:30	Bangad	Philippines	0.1
	14 Apr 2021 17:30	Manolib	Philippines	0.1
	14 Apr 2021 17:30	Asid	Philippines	0.1
	14 Apr 2021 17:30	Calumpang	Philippines	0.1
	14 Apr 2021 17:30	Borongan	Philippines	0.1
	14 Apr 2021 17:30	Barra	Philippines	0.1
	14 Apr 2021 17:30	Malbug	Philippines	0.1
	14 Apr 2021 19:15	Libjo	Philippines	0.1
	14 Apr 2021 19:15	Magdalo	Philippines	0.1
	14 Apr 2021 17:15	Mandaon	Philippines	0.1
	14 Apr 2021 17:15	Panguiranan	Philippines	0.1
	14 Apr 2021 23:45	Maligay B	Philippines	0.1
	14 Apr 2021 23:45	Lukuban	Philippines	0.1
	14 Apr 2021 23:45	Barabuan	Philippines	0.1
	14 Apr 2021 23:45	Pitogo	Philippines	0.1
	14 Apr 2021 23:45	Dinas	Philippines	0.1
	14 Apr 2021 23:45	Dimataling	Philippines	0.1
	14 Apr 2021 23:45	Daplayan	Philippines	0.1
	14 Apr 2021 23:45	Pisan	Philippines	0.1
	14 Apr 2021 23:45	Taraka	Philippines	0.1
	14 Apr 2021 23:45	Pantad	Philippines	0.1
	14 Apr 2021 23:45	Salip	Philippines	0.1
	14 Apr 2021 23:45	San Pablo	Philippines	0.1
	14 Apr 2021 23:45	Napulan	Philippines	0.1
	14 Apr 2021 23:45	Culacion	Philippines	0.1
	14 Apr 2021 19:45	Mapid	Philippines	0.1
	14 Apr 2021 19:45	Balaton	Philippines	0.1
	14 Apr 2021 19:45	Garchitorena	Philippines	0.1
	14 Apr 2021 23:00	Malinao	Philippines	0.1
	14 Apr 2021 22:30	Busuanga	Philippines	0.1
	14 Apr 2021 22:30	Salvacion	Philippines	0.1
	14 Apr 2021 22:30	Bogtong	Philippines	0.1
	14 Apr 2021 22:30	Concepcion	Philippines	0.1
	14 Apr 2021 22:30	Kiwit	Philippines	0.1
	14 Apr 2021 17:30	Labigan	Philippines	0.1
	14 Apr 2021 17:30	Guiom	Philippines	0.1
	14 Apr 2021 23:15	Hua-hsu	Taiwan	0.1
	14 Apr 2021 18:45	Sauang	Philippines	0.1
	14 Apr 2021 18:45	Kandamal	Philippines	0.1
	14 Apr 2021 18:45	Uson	Philippines	0.1
	14 Apr 2021 18:45	Palanas	Philippines	0.1
	14 Apr 2021 18:45	Malobago	Philippines	0.1
	14 Apr 2021 14:45	Pagtilaan	Philippines	0.1
	14 Apr 2021 14:45	Boston	Philippines	0.1
	14 Apr 2021 14:45	Cateel	Philippines	0.1
	14 Apr 2021 22:45	Pandan	Philippines	0.1
	14 Apr 2021 22:30	San Nicolas	Philippines	0.1
	14 Apr 2021 22:30	Bangwang Daan	Philippines	0.1
	14 Apr 2021 22:30	Banuang Daan	Philippines	0.1
	14 Apr 2021 16:45	Daraga	Philippines	0.1
	14 Apr 2021 16:45	Legaspi	Philippines	0.1
	14 Apr 2021 16:45	Malilipot	Philippines	0.1
	14 Apr 2021 16:45	Libog	Philippines	0.1
	14 Apr 2021 16:45	San Francisco	Philippines	0.1
	14 Apr 2021 16:45	Pili	Philippines	0.1
	14 Apr 2021 16:45	Manito	Philippines	0.1
	14 Apr 2021 16:45	Pagnanitojan	Philippines	0.1
	14 Apr 2021 22:15	Aringay	Philippines	0.1
	14 Apr 2021 16:15	Attalabul	Palau	0.1
	14 Apr 2021 16:15	Ngalkol	Palau	0.1
	14 Apr 2021 15:30	Colonia	Micronesia	0.1
	14 Apr 2021 19:45	Daraon	Philippines	0.1
	14 Apr 2021 19:45	Baranbang	Philippines	0.1
	14 Apr 2021 19:45	Calubian	Philippines	0.1
	14 Apr 2021 19:45	Lico	Philippines	0.1
	14 Apr 2021 19:45	Biliran	Philippines	0.1
	14 Apr 2021 19:45	Leyte	Philippines	0.1
	14 Apr 2021 19:45	Consuegra	Philippines	0.1
	14 Apr 2021 19:45	Cabucgayan	Philippines	0.1
	14 Apr 2021 19:45	Caibiran	Philippines	0.1
	14 Apr 2021 19:45	Managasnas	Philippines	0.1
	14 Apr 2021 19:45	Bonga	Philippines	0.1
	14 Apr 2021 19:45	Capoocan	Philippines	0.1
	14 Apr 2021 19:45	Sugud	Philippines	0.1
	14 Apr 2021 19:45	Carigara	Philippines	0.1
	14 Apr 2021 19:45	Barugo	Philippines	0.1
	14 Apr 2021 22:15	Agoo	Philippines	0.1
	14 Apr 2021 22:15	Sibaltan	Philippines	0.1
	14 Apr 2021 22:15	Maytiguid	Philippines	0.1
	14 Apr 2021 22:15	Batas	Philippines	0.1
	14 Apr 2021 22:15	Pinamalayan	Philippines	0.1

Disclaimer
While we try everything to ensure accuracy, this information is purely indicative and should not be used for any decision making without alternate sources of information.
The JRC is not responsible for any damage or loss resulting from the use of the information presented on this website.
The designations employed and the presentation of material on the map do not imply the expression of any opinion whatsoever on the part of the European Union concerning the legal status of any country, territory or area or of its authorities, or concerning the delimitation of its frontiers or boundaries.