Agger

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What Wikipedia says

An agger (Latin) is an ancient Roman linear mound or embankment. The word is sometimes applied to fortifications, such as the Agger Servianus, a part of the Servian Wall of Rome, which protected the city on its most vulnerable side, the Campus Esquilinus.

Excerpt from the Wikipedia article “Agger (ancient Rome)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Mac, CC BY-SA 3.0, via Wikimedia Commons.