The Tchamba river valley, on the east coast of Grande-Terre, marks the boundary between the territories of the municipalities of Poindimié to the north and Ponérihouen - which means 'the mouth of the river' in the local vernacular Paicî language – to the south. Like most of the numerous estuaries of the east coast, its estuary is crossed by a large bridge to allow the road continuity of the territory.