Cap d’Agde , low and rocky, is located 9.5 miles ENE of Valras-Plage. Montagne du Gros Frere, 848m high, stands 29 miles N of the cape and may be sighted on a clear day from a considerable distance to the S. Mont d’Agde, 115m high, stands 1.5 miles NNW of the cape. It is isolated and conical and can easily be identified at a distance of 12 miles.
Between the cape and the mouth of the River Herault, 3 miles W, the coast is fronted by rocks and rocky points. Pointe de Roche Longue, located midway along this stretch, is surmounted by an old battery. Two radio masts stand 1 mile N of the battery and are prominent.