- ¨Porz Guen¨ : mud flat on the left bank of the river Odet, in 3 km upstream to the ¨Pointe de Combrit¨ (free sea) (7 samples),
- ¨Anse Saint Cadou¨ : mud flat 12 km upstream to the ¨Pointe de Combrit¨ and in 2 km of the main course of the river Odet ; this digitation of the
valley is gone through by a brook (11 samples),
- ¨Mer Blanche¨ : slikke and puddles on the schorre, 1 to 2,5 km from the entry of the swamp (10 samples),
- ¨Anse de Penfoulic¨ : mud flat in 1 km of the entry of this small estuary (10 samples).