It flows with wide loops in a generally south-southeast direction, passes under the T10 coastal road, and enters the Étang de Balistra, a lagoon.

The lagoon drains into the sea through a channel at the north end of the Plage de Balistra.

The watershed above this station covers 29 square kilometres (11 sq mi).

The average flow of water throughout the year was 0.2 cubic metres per second (7.1 cu ft/s).

The following streams (ruisseaux) are tributaries of the Francolu (ordered by length) and sub-tributaries:[1]