<Tr> <Th> INSEE / Postal code </Th> <Td> 50353 / 50116 </Td> </Tr> <Tr> <Th> Elevation </Th> <Td> 5--80 m (16--262 ft) </Td> </Tr> <Tr> <Td_colspan="2"> <P> French Land Register data, which excludes lakes, ponds, glaciers> 1 km2 (0.386 sq mi or 247 acres) and river estuaries . </P> Population without double counting: residents of multiple communes (e.g., students and military personnel) only counted once . </Td> </Tr> <P> French Land Register data, which excludes lakes, ponds, glaciers> 1 km2 (0.386 sq mi or 247 acres) and river estuaries . </P>

When is mont st michel surrounded by water