They could be hiding in Jabal-Al Halal -- a rugged mountain terrain in central Sinai.
Many traverse nature reserves, meander along rivers or venture into steep mountain terrain.
Completed in 1979, it was one of the great engineering feats of the age, crossing some of the most difficult mountain terrain on Earth.
The base is located in the strategic Pech River valley once dubbed the "Valley of Death" because mountain terrain allowed insurgents to stage deadly ambushes.
Explores some of the world's most remote mountain terrain while continuing Jones' mission to camp deep in the backcountry and on the summits of unridden lines to access nearly vertical spines and wide-open powder fields.
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Climbing the six Abels in the brutal Western Arthurs Range, located inside the World Heritage-listed Tasmanian Wilderness Area that covers 20% of the island, necessitates a walk through such difficult mountain terrain that it can take walkers up to two weeks to hike what is often described as the most difficult bushwalk in Australia.
The Race2Recovery team is hoping to become the first disability team to complete the challenge, which takes in around 9, 000 kilometers of extreme mountain and desert terrain.
"In addition, this particular area is of European importance due to its wildlife and therefore it will be a challenge to transport the bodies off the mountain without damaging the terrain, " he added.
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Buttermilk is an easy mountain with lots of green and blue terrain, but is also the home of the X Games, so teens and tweens love to go where their idols ski and ride.
Tuck into the Captain Crunch French toast or the eggs Benedict while you map out your agenda for the day (the mountain has more than 5, 289 acres of terrain, after all).
White-knuckle skiers and snowboarders love the mountain for its advanced black diamond runs and four different terrain parks, with practice jumps and half-pipes.
The new twist will be a member-only lodge (under construction now) and an event center atop the mountain, and expanded access to adventure skiing and hiking terrain.
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Though Squaw's most obvious attraction is the mountain's awesome 4, 000 acres of skiable terrain and 2, 850-foot vertical drop, the area abounds with activities year-round, including golf, climbing, horseback riding and hiking.
At the opposite end of the spectrum is Buttermilk, an entire mountain focused on learning, with a plethora of beginner and intermediate terrain, very family friendly and simply one of the best places on earth to learn to ski or snowboard, with both great terrain and a top quality ski school.
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Farther down the mountain, at Barisakho, stands a warning to grandiose plans in the forbidding Caucasus terrain.
We follow Zambou's car down the winding mountain road, closer to Tiji, our crew still marveling at the brutal yet spectacular terrain.
The ski mountain is very easy to navigate, and has lots of groomed slopes with perfect beginner and intermediate terrain for learning.
Intelligence officials believe bin Laden is hiding in the tribal areas of northwest Pakistan, a remote and primitive region with mountain peaks as tall as 14, 000 feet (4, 270 meters) that make the terrain difficult to navigate.
The islands are in fact the peaks of a sub-Atlantic mountain range that rises more than 4, 000 feet from the sea bed, forming sheer cliffs and often impassable terrain.
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