The Casamance River flows westward for the most part into the Atlantic Ocean along a path about 200 miles in length. However, only 80 miles are navigable. The Casamance is the principal river of the Kolda, Sédhiou, and Ziguinchor Regions in the southern portion of Senegal. It is located between the Gambia River to the north and the Cacheu and Geba riv…The Casamance River flows westward for the most part into the Atlantic Ocean along a path about 200 miles in length. However, only 80 miles are navigable. The Casamance is the principal river of the Kolda, Sédhiou, and Ziguinchor Regions in the southern portion of Senegal. It is located between the Gambia River to the north and the Cacheu and Geba rivers to the south.