The river flows generally in a westerly direction out of the highlands, crosses the southern extension of the Bemaraha Plateau, reaches the coastal plain and its delta, and enters the Mozambique Channel north of the city of Morombe at 21°19′00″S 43°32′00″E / 21.316667°S 43.533333°E / -21.316667; 43.533333.
Most of Madagascar has undergone serious deforestation during the last 40 years, chiefly from slash-and-burn practises by indigenous peoples.
Between the lake and the coast is a rather large, whitish area of sand interspersed with silt-laden ponds.
The southern portion of the delta is dominated by successive barrier island and spit formation.
In contrast, the northern, protected portion of the delta is dominated by tidal passes and mangrove swamps.