請問世界上最深的山谷的名字是什麼?

請問世界上最深的山谷的名字是什麼？
赫爾峽谷(Hell's Canyon)

圖片參考：http://upload.wikimedia.org/wikipedia/commons/thumb/3/36/OR_hells_canyon.jpg/250px-OR_hells_canyon.jpg

The Canyon is mostly public land, much of which is designated wilderness. The Canyon is massive, arid, and provides extremely stark, spectacular scenery. Solitude can be hard to find at peak use times; there are numerous jet boats, especially below Rush Creek. The lower river is often crowded on summer weekends. Few roads enter the Canyon, and those that do exist usually require 4-wheel drive.
Drainage Area and Average Annual Discharge: 92,960 square miles (241,000 km²) and 27,500,000 acre-feet (34 km³).

In America there is a famous valley which is 349km long.