Coral reef to form fringing reefs, and can eventually grow become a barrier reef. Where the bottom is rising, fringing reefs can grow around the coast, but coral raised above sea level dies. If the land subsides slowly, the fringing reefs keep pace by growing upwards on a base of older, dead coral, forming a barrier reef enclosing a lagoon between the reef and the land. A barrier reef can encircle an island, and once the island sinks below sea level a roughly circular atoll of growing coral continues to keep up with the sea level, forming a central lagoon. Barrier reefs
Lymington Open Air Sea Water Baths Lymington Open Air Sea Water Baths The Lymington Open Air Sea Water Baths (or "historic Roman Seawater Baths") is a lifeguarded open air lido in Lymington, Hampshire, England. Built in 1833, it is the oldest lido in the United Kingdom, and at 110 metres long by 50 metres wide it is also one of the largest in area. The baths reopened in 2010 following a campaign by local people who also completed the baths' refurbishment. The pool uses filtered and chlorinated seawater. Owned and managed by Lymington and Pennington Town Council, the opening season is normally from May to September.