The Cassiporé river can be navigated by boats drawing under 2 metres (6 ft 7 in) as far as the town of Japa, 24 miles inland.[1] The tidal range at the river mouth is less than 4 metres (13 ft).[2] The Cassipore River run through the most northern part of the Amapá mangroves ecoregion along the bay where it flows into the Atlantic Ocean.[3]