This strongpoint Gi 353 (WN Ulm) is the last one in the Freie Küste Soulac sur Mer. After this stronpoint we enter the Arcachon area. Ulm has 2 x 600 and 2 x 667. The German map that guided us through this entire trip shows here that both bunkers 600 had an extra watersupply. We only found one.
The IGN designation is "Léde: the forest, along the D102".
Cement bags and the start of the concrete road which goes all along the coast.