river rising near the Benin border, northeast of Sokodé, Togo. It flows 250 miles (400 km) in a meandering course to empty into the Bight of Benin near Ouidah, Benin. For the lower part of its course it forms the border between Togo and Benin. At its mouth it is linked through a channel with Lake Togo, a lagoon south of Akoumapé. The natural vegetation of the undulating clay tableland that the Mono drains has been replaced largely by cultivated areas of corn (maize), cassava, yams, rice, and cotton. Navigation is possible near the river's mouth.