The bar was formed by the mud and sand deposited here over a long period of time.

河里的泥沙淤积在这里，年深日久便成了沙洲。

《新英汉大辞典》

The camel's feet, well adapted for dry sand, are useless on mud.

骆驼的脚十分适合干旱沙地，但在泥地上毫无用处。

《柯林斯英汉双解大词典》

She rushed outside in time to see a half-mile wide mud and sand thundering down the hill toward them, knocking over hundreds of trees.

她及时跑了出去，看到半英里宽的泥沙从山上轰隆隆地向他们冲来，撞翻了几百棵树。

youdao

The walker had to be pulled from the waterlogged mix of mud and sand by Dorset Fire Service on Friday.

BBC: Walker saved from waterlogged Swanage beach

Steamers are usually harvested from sand or mud tidal flats.

NPR: Recipes: 'The Summer Shack Cookbook'

The event is held every Memorial Day weekend in Ferndale, California, as artists race their bizarre wares across a 42-mile course over three days, including sections on land, sand, mud and water.

BBC: Kinetic sculptures race land and sea