sentences:  The lake's small size, only 0.8 km by 0.6 km, creates an unusual habitat of highly oxygenated yet warm seawater that sustains an enormous variety of plants and animals, many of which are not found anywhere else in Ireland.A wide variety of environments such as cliffs, salt marsh, beach, and areas of greatly varying water movement add to the area's biodiversity.Some of the seawalls around the lake and the Rapids were built as relief work during the Great Hunger.