They banked the earth (up) into a mound.

他们把土堆成一个土丘。

《牛津词典》

The Island of Dreams is a mound of earth blanketed in vibrant wild flowers.

“梦之岛”是一个覆盖满了鲜艳野花的小土丘。

youdao

And the day after the last survivor of the Great Escape died, he did a cartoon showing a gravestone with a mound of tunnelled earth trailing away from it.

在胜利大逃亡的最一位后幸存者去世的第二天，他画了漫画，画上是一座墓碑，一大堆挖过的土往后翻着。

youdao

The people are still inside them as far as we can be aware: the barrow mound, the earth mound is still intact.

BBC: Snow survey uncovers prehistoric sites in Wales

The father-of-four's body was found between the 27-year-old vehicle's wheel and a mound of earth.

BBC: Thomas Phizacklea