Picture information:


这张照片拍摄于2005年9月。地点:Grand canyon National Park 。美国亚利桑那州西北部科罗拉多河的一个大峡谷。

It was taken in Sept.2005.I was in Grand canyon National Park.

A gorge of the Colorado River in northwest Arizona. It is up to 1.6 km (1 mi) deep, from 6.4 to 29 km (4 to 18 mi) wide, and more than 321.8 km (200 mi) long. The eroded walls of the canyon record many centuries of geologic time.