Photo taken on Aug. 11, 2012 shows a bird's view of mountains of the Alaska Range in Alaska, the United States. The Alaska Range is a relatively narrow, 650-km-long mountain range in the south-central region of Alaska, from Lake Clark and its southwest end to the White River in Canada's Yukon Territory in the southeast. The highest mountain in North America, Mount McKinley, is in the Alaska Range. (Xinhua/Shen Hong)

 Photo taken on Aug. 11, 2012 shows the Mount McKinley of the Alaska Range in Alaska, the United States. The Alaska Range is a relatively narrow, 650-km-long mountain range in the south-central region of Alaska, from Lake Clark and its southwest end to the White River in Canada's Yukon Territory in the southeast. The highest mountain in North America, Mount McKinley, is in the Alaska Range. (Xinhua/Shen Hong)

Photo taken on Aug. 11, 2012 shows a bird's view of mountains of the Alaska Range in Alaska, the United States. The Alaska Range is a relatively narrow, 650-km-long mountain range in the south-central region of Alaska, from Lake Clark and its southwest end to the White River in Canada's Yukon Territory in the southeast. The highest mountain in North America, Mount McKinley, is in the Alaska Range. (Xinhua/Shen Hong)

Photo taken on Aug. 11, 2012 shows a bird's view of mountains and glaciers of the Alaska Range in Alaska, the United States. The Alaska Range is a relatively narrow, 650-km-long mountain range in the south-central region of Alaska, from Lake Clark and its southwest end to the White River in Canada's Yukon Territory in the southeast. The highest mountain in North America, Mount McKinley, is in the Alaska Range. (Xinhua/Shen Hong)

Photo taken on Aug. 11, 2012 shows a bird's view of mountains of the Alaska Range in Alaska, the United States. The Alaska Range is a relatively narrow, 650-km-long mountain range in the south-central region of Alaska, from Lake Clark and its southwest end to the White River in Canada's Yukon Territory in the southeast. The highest mountain in North America, Mount McKinley, is in the Alaska Range. (Xinhua/Shen Hong)

Photo taken on Aug. 11, 2012 shows a bird's view of a glacier of the Alaska Range in Alaska, the United States. The Alaska Range is a relatively narrow, 650-km-long mountain range in the south-central region of Alaska, from Lake Clark and its southwest end to the White River in Canada's Yukon Territory in the southeast. The highest mountain in North America, Mount McKinley, is in the Alaska Range. (Xinhua/Shen Hong)

Photo taken on Aug. 11, 2012 shows a bird's view of mountains and glaciers of the Alaska Range in Alaska, the United States. The Alaska Range is a relatively narrow, 650-km-long mountain range in the south-central region of Alaska, from Lake Clark and its southwest end to the White River in Canada's Yukon Territory in the southeast. The highest mountain in North America, Mount McKinley, is in the Alaska Range. (Xinhua/Shen Hong)

Photo taken on Aug. 11, 2012 shows a bird's view of mountains of the Alaska Range in Alaska, the United States. The Alaska Range is a relatively narrow, 650-km-long mountain range in the south-central region of Alaska, from Lake Clark and its southwest end to the White River in Canada's Yukon Territory in the southeast. The highest mountain in North America, Mount McKinley, is in the Alaska Range. (Xinhua/Shen Hong)

Photo taken on Aug. 11, 2012 shows a bird's view of mountains of the Alaska Range in Alaska, the United States. The Alaska Range is a relatively narrow, 650-km-long mountain range in the south-central region of Alaska, from Lake Clark and its southwest end to the White River in Canada's Yukon Territory in the southeast. The highest mountain in North America, Mount McKinley, is in the Alaska Range. (Xinhua/Shen Hong)

Photo taken on Aug. 11, 2012 shows a bird's view of mountains of the Alaska Range in Alaska, the United States. The Alaska Range is a relatively narrow, 650-km-long mountain range in the south-central region of Alaska, from Lake Clark and its southwest end to the White River in Canada's Yukon Territory in the southeast. The highest mountain in North America, Mount McKinley, is in the Alaska Range. (Xinhua/Shen Hong)