Crossing the bay: only with a guide

Never cross the bay on your own. The dangers listed by the official sources: quicksand, shifting watercourses, daily water releases from the dam into the Couesnon and the fast-rising tide.

Crossings are led by guides certified by the Manche prefecture. The list and bookings are on the tourist office website.

A good level of fitness is required.

Sources: montsaintmichel.gouv.fr, office de tourisme — checked on 15 November 2026.