Great Blue Hole
The Great Blue Hole is a giant marine sinkhole off the coast of Belize. It lies near the center of Lighthouse Reef, a small atoll from the mainland and Belize City. The hole is circular in shape, across and deep. It was formed during several episodes of quaternary glaciation when sea levels were much lower. Analysis of stalactites found in the Great Blue Hole shows that formation took place 153,000; 66,000; 60,000; and 15,000 years ago. As the ocean began to rise again, the cave was flooded. The Great Blue Hole is a part of the larger Belize Barrier Reef Reserve System, a World Heritage Site of the United Nations Educational, Scientific and Cultural Organization (UNESCO).
Blue Hill, Saint Helena
Terrain in the district is quite varied with steep ridges and a limited amount of flat ground, as befits the island's volcanic origin. Blue Hill's main settlement, with the location of the community centre, is Blue Hill Village. The district also includes the settlements of Barren Ground, Head o' Wain, and Thompson's Wood, together with a few scattered cottages.