Cabo Cassiporé is a low promontory about 6 miles (9.7 km) east of the wide entrance to the river.

[1] The Cassiporé river can be navigated by boats drawing under 2 metres (6 ft 7 in) as far as the village of Japa, 24 miles inland.

[1] The tidal range at the river mouth is less than 4 metres (13 ft).

[2] The Cassiporé River runs through the most northern part of the Amapá mangroves ecoregion along the bay where it flows into the Atlantic Ocean.

This article related to a river in Amapá, Brazil is a stub.