Oyapock

Oyapock
View of the Oyapock River from Brazil toward French Guiana
Guyane Oyapock River map
Location
CountriesBrazil and France
Physical characteristics
Source 
 • locationTumuk Humak Mountains
Mouth 
 • location
Atlantic Ocean
 • coordinates
04°14′08″N 51°36′53″W / 4.23556°N 51.61472°W / 4.23556; -51.61472
Length403 km (250 mi)
Basin size30,869 km2 (11,919 mi2)
Discharge 
 • locationNear mouth
 • average1,457 m3/s (51,500 cu ft/s)
Basin features
BridgesOyapock River Bridge

The Oyapock or Oiapoque (/ˈɔɪ.əpɒk, ˌɔɪ.əˈpki/ OY-ə-pok, OY-ə-POH-kee; French: Fleuve Oyapock [flœv ojapɔk]; Portuguese: Rio Oiapoque [ˈʁi.u ojaˈpɔki]) is a 403-kilometre (250 mi) long river in South America that forms most of the border between the French overseas department of French Guiana and the Brazilian state of Amapá.