The Great Blue Hole is located off the coast of Belize - it is found in the middle of the Lighthouse Reef ecosystem. The Great Blue Hole measures 984 feet (300 m) across. The sink hole plunges 394 feet (120 m) deep and provides divers with a crystal clear haven for exploring this underwater wonder #travel...x
Deans Blue Hole in the Bahamas. Currently the worlds deepest sea-hole at 663-feet, it's almost twice as deep as any of the other Blue Holes in the Caribbean that were formed when limestone chambers caved in from above.
Blue Hole in Santa Rosa, NM | Blue Hole appears in the midst of the desert like a great blue gem. ( Agua Negra Chiquita) Once known as Blue Lake, it is one of seven sister lakes connected underground by a vast system of water.