Antelope Canyon is located near Page on Navajo Nation land, just outside Glen Canyon National Recreation Area and close to AZ 98 a few miles east of town (at milepost 299). Antelope is the most visited slot canyon in the Southwest, partly because it is easily accessible and by far the most publicized, and also since it is extremely beautiful, with just the right combination of depth, width, length, rock color and ambient light; many other slot canyons are deeper, narrower or longer, and some have rock that is even more colorful and sculptured, but here conditions are ideal.
Antelope Canyon is a popular location for photographers and sightseers, and a source of tourism business for the Navajo Nation. It has been accessible by permit only since 1997, when the Navajo Tribe made it a Navajo Tribal Park. Photography within the canyons is difficult due to the wide exposure range (often 10 EV or more) made by light reflecting off the canyon walls. Once inside, the temperature drops as much as 20 degrees as the visitor enters one of the most beautiful of all natural formations.
Upper Antelope Canyon
Upper Antelope Canyon, called Tse bighanilini, "the place where water runs through rocks" by the Navajo. It is the most frequently visited by tourists, due to two considerations. First, its entrance and entire length are at ground level, requiring no climbing. Second, beams (shafts of direct sunlight radiating down from openings in the top of the canyon) are much more common in Upper than in Lower. Beams occur most often in the summer months, as they require the sun to be high in the sky. Light beams start to peek into the canyon March 15 and disappear October 7 each year.
Lower Antelope Canyon
Lower Antelope Canyon, called Hasdeztwazi, or "spiral rock arches" by the Navajo, is located a few kilometers away. Prior to the installation of metal stairways, visiting the canyon required climbing with ropes and ladders in certain areas. Even following the installation of stairways, it is a more difficult hike than Upper Antelope -- it is longer, narrower in spots, and even footing is not available in all areas.
Despite these limitations, Lower Antelope Canyon draws a considerable number of photographers, though casual sightseers are much less common there than in Upper.
The lower canyon is in the shape of a "V" and shallower than the Upper Antelope. Lighting is better in the early hours and late afternoon.
Flash flood danger
Antelope Canyon is visited exclusively through guided tours, in part because rains during monsoon season can quickly flood the canyon. Rain does not have to fall on or near the Antelope Canyon slots for flash floods to whip through, as rain falling dozens of miles away 'upstream' of the canyons can funnel into them with little prior notice. On August 12, 1997, eleven tourists, including seven from France, one from the United Kingdom, one from Sweden and two from the United States, were killed in Lower Antelope Canyon by a flash flood. Very little rain fell at the site that day, but an earlier thunderstorm had dumped a large amount of water into the canyon basin, seven miles upstream. The lone survivor of the flood was tour guide Francisco "Poncho" Quintana, who had prior swift-water training. At the time, the ladder system consisted of amateur-built wood ladders that were swept away by the flash flood. Today, ladder systems have been bolted in place, and deployable cargo nets are installed at the top of the canyon. At the fee booth, a radio from the National Weather Service and alarm horn are stationed.
Source: http://en.wikipedia.org/ ; www.americansouthwest.net/
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