Oyapock River

Oyapock RiverOyapock River on the French Guiana–Brazil border.

Oyapock River, river that forms the border between French Guiana and the Brazilian state of Amapá. It rises in the Tumuc-Humac Mountains and flows northeast for 311 miles (500 km) to empty into the Atlantic near Cape Orange. The country through which it passes is thinly populated and is mostly covered by an unbroken tropical rain forest. Near the river’s mouth are the ports of Saint-Georges, French Guiana; and Oiapoque and Ponta dos Índios, Brazil.

This article was most recently revised and updated by Amy Tikkanen.
Citation Information
Article Title: Oyapock River
Website Name: Encyclopaedia Britannica
Publisher: Encyclopaedia Britannica, Inc.
Date Published: 14 August 2008
Access Date: February 22, 2025