What is "chassezac"

The Chassezac is an long river in the Lozère, Gard and Ardèche départements, southern France, right tributary of the Ardèche. Its source is in the commune of Saint-Frézal-d'Albuges, northeast of Les Chazeaux, main hamlet in the commune. It flows generally southeast and flows into the Ardèche at Saint-Alban-Auriolles, east of the village itself.