der Wall
rampart
A long, man-made mound of earth that served to defend a castle or city.
Die alte Festung ist noch heute von einem mächtigen Wall umgeben.
The old fortress is still surrounded by a mighty rampart today.

rampart / embankment
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rampart
A long, man-made mound of earth that served to defend a castle or city.
Die alte Festung ist noch heute von einem mächtigen Wall umgeben.
The old fortress is still surrounded by a mighty rampart today.

'Der Wall' is not a universal word for 'wall'. It specifically refers to a large mound of earth used for defense ('Wallanlage', rampart system) or flood protection ('Deich', dike). A typical wall made of stone or inside a house is 'die Mauer' or 'die Wand'.
Die Touristen spazierten auf dem alten Wall um die Stadt.
The tourists walked along the old rampart around the city.
The context tells you what kind of 'Wall' is meant. Words like 'Burg' (castle), 'Festung' (fortress), or 'Verteidigung' (defense) point to a historical defensive structure. Words like 'Küste' (coast), 'Fluss' (river), 'Meer' (sea), or 'Hochwasser' (flooding) point to a dike for water protection.
Der Wall konnte die mittelalterliche Stadt vor Angriffen schützen.
The rampart could protect the medieval city from attacks.
In historical contexts, 'Wall' is often used with verbs such as 'errichten' (to build/erect), 'umgeben' (to surround), or 'schützen' (to protect). Adjectives include, for example, 'mächtig' (mighty), 'hoch' (high), or 'historisch' (historical).
Ein mächtiger Wall aus Erde und Stein umgab die Burg.
A mighty rampart of earth and stone surrounded the castle.
wall
'die Mauer' and 'der Wall' can both refer to something people build to protect or separate off an area. A 'Mauer' is usually made of stone, brick, or concrete and has a solid, vertical form. A 'Wall' is more of a long embankment, often made of earth, and is especially used for old defensive structures or protection against water. Learners may confuse the words because both can act like a boundary or protection. For a solid stone or concrete wall, you normally say 'Mauer'. For earth-based protection or a dike, 'Wall' fits better.

Der alte Wall schützte früher die Stadt vor Angriffen.
The old rampart once protected the city from attacks.
Hinter dem Garten steht eine hohe Mauer aus roten Ziegeln.
Behind the garden there is a high wall made of red bricks.