Adjaha is an arrondissement in the Mono department of Benin.

It is an administrative division under the jurisdiction of the commune of Grand-Popo.

According to the population census conducted by the Institut National de la Statistique Benin on February 15, 2002, the arrondissement had a total population of 5,787.

Different races are living in Adjaha like Pedah, Fon, Kotafon, and Aïzo.

This Mono Department location article is a stub.