Abstract
The seasonal beach rotation visible in Sakouli beach reflects : the two distinct hydrodynamic conditions that occur in Mayotte and a residual longshore sediment transport favored by a low bay indentation. However, the island subsidence of 10 to 20 cm since 2018 may have an impact over this equilibrium. Indeed, this could lead to higher wave energy over the beach. So, study must be continued and extended to several other beaches on the island.