Incredible Places on Earth (1)
Blue Hole Dahab Bottom - A blue hole is a submarine cave or sinkhole. They are also called vertical caves.
Blue holes are roughly circular, steep-walled depressions, and so named for the dramatic contrast between the dark blue, deep waters of their depths and the lighter blue of the shallows around them. Their water circulation is poor, and they are commonly anoxic below a certain depth; this environment is unfavorable for most sea life, but nonetheless can support large numbers of bacteria.
Blue holes formed during past ice ages, when sea level was as much as 100-120 meters lower than at present. At those times, these formations were subjected to the same chemical weathering common in all limestone-rich terrains; this ended once they were submerged at the end of the ice age.
Blue holes are typically found on shallow carbonate platforms, exemplified by the Bahama Banks, as well as on and around the Yucatán Peninsula, such as at the Great Blue Hole at Lighthouse Reef Atoll, Belize.
The deepest blue hole in the world is Dean’s Blue Hole at 663ft. The next deepest holes are only around 350-400 feet deep.
ANTELOPE CANYON, Northern Arizona - The Antelope Canyons are the now world famous slot canyons of Northern Arizona. There are two distinct canyons – the lower canyon that sheds water directly into the Colorado River basin at Lake Powell and the upper canyon which feeds the lower canyon via a large wash. Both are accessible to photographers. The upper canyon is a simple walk-in affair after being transported to the entrance by your Navajo guide. The lower canyon requires you to squeeze through a narrow opening at the south end of the canyon and then traverse down some narrow stairs and ladders to the bottom of the canyon. Photography in both canyons is excellent.
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