population of about 30,000 people.

The original inhabitants of Ardra were ethnic Aja. According to oral tradition, the Aja migrated to southern Benin around the 12th or 13th century, coming from Tado, on the Mono River in modern Togo. They established themselves in the area that currently corresponds to southern Benin, until c. 1600, when three brothers - Kokpon, Do-Aklin, and Te-Agdanlin - split