Terreplein
Encyclopedia
Terreplein, or terre-plein — in fortification
Fortification
Fortifications are military constructions and buildings designed for defence in warfare and military bases. Humans have constructed defensive works for many thousands of years, in a variety of increasingly complex designs...

s is the top, platform, or horizontal surface, of a rampart, on which cannon are placed. In Martello towers
Martello tower
Martello towers are small defensive forts built in several countries of the British Empire during the 19th century, from the time of the Napoleonic Wars onwards....

, the roof or terreplein was sometimes surmounted with one or two cannon on a gun platform with a central pivot that enabled the guns to rotate up to 360 degrees.

In civil engineering
Civil engineering
Civil engineering is a professional engineering discipline that deals with the design, construction, and maintenance of the physical and naturally built environment, including works like roads, bridges, canals, dams, and buildings...

works, a terreplein is an embankment of earth with a broad level top, which is sometimes excavated to form a continuation of an elevated canal across a valley.
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