they are called dykes.
A large mound or raised area of earth is called a hill or mound.
The motte is the the mound of earth the castle was built on.
Earth miterial
They were known for their agriculture, art and mound building of ceremonial and burial sites.
The Mound Builders built mounds of earth and stone
which civilization built the great mound.
Because they built large mounds for ceremonial and burial use.
Mound Builders
embankment is; a long mound of earth or store, sometimes built to raise a roadway.
A Motte is a man made mound of earth in which a Norman tower or a dungeon is built on.
The Adena Mound
A tell or tel .