克兰大峡谷位于阿勒泰市北部，属克兰河上游河谷，当地人也称之为“小东沟”，距阿市中心区约11公里，海拔970米。提起小东沟，必然还有大东沟，大小东沟汇流后即是克兰河。这里河水汇流，急泻如箭，河床中乱石穿空，惊涛似雪。两岸密林铺绿叠翠，群峰挺拔，怪石嶙峋。再前行，奇峰夹峰，水流平缓，山重水复，当地人戏称之为“小漓江”。景致幽深而原始，神秘而充满奇趣。沟的源头在乌尔麦盖堤大坂，也是克兰河的源头。沟处在山谷之中，两测山势陡峭，坡度30－40 度,沟谷生长着茂密的桦树和杨树，偶有云杉生长，越往沟上游走，云杉、红松等针叶树种增多，阔叶树种减少，现在游客最多的沟段主要生长的树种是阔叶树种。

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