雅丹地貌，或者称为风蚀脊（Yardang）是一种典型的风蚀性地貌。“雅丹”在**中的意思是“具有陡壁的小山包”。由于风的磨蚀作用，小山包的下部往往遭受较强的剥蚀作用，并逐渐形成向里凹的形态。如果小山包上部的岩层比较松散，在重力作用下就容易垮塌形成陡壁，形成雅丹地貌，有些地貌外观如同古城堡，俗称魔鬼城。

由一系列平行的垄脊和沟槽构成，顺盛行风方向延长；高半米至几米，长数十米到数百米不等；沟宽1－2米；在中国**罗布泊东北发育很典型。

维基共享资源中相关的多媒体资源：雅丹地貌

A yardang is a streamlined protuberance carved from bedrock or any consolidated or semiconsolidated material by the dual action of wind abrasion by dust and sand, and deflation which is the removal of loose material by wind turbulence. Yardangs become elongated features typically three or more times longer than wide, and when viewed from above, resemble the hull of a boat. Facing the wind is a steep, blunt face that gradually gets lower and narrower toward the lee end. Yardangs are formed by wind erosion, typically of an originally flat surface formed from areas of harder and softer material. The soft material is eroded and removed by the wind, and the harder material remains. The resulting pattern of yardangs is therefore a combination of the original rock distribution, and the fluid mechanics of the air flow and resulting pattern of erosion.