In the Tianshuihai area, small pingos, unsorted circles, sand wedges and polygons, and other periglacial phenomena were identified.

地区发现大量小型冻胀丘、石环冰缘现存。

A prismatoid having polygons with the same number of sides as bases, and faces that are parallelograms or trapezoids.

四个边相平行四边形；不是直边平行四边形。