ravelin
thumb|Two ravelins (top left of image) in Goes, The Netherlands thumb|Ravelin in the Dutch town of Bergen op Zoom thumb|300px|Ravelin protecting the entrance of Fort McHenry, [[Baltimore, Maryland]] thumb|The Moers fortifications, designed by [[Simon Stevin, where ravelins appear as triangular shapes surrounded by water, with wall (shown in dark green) facing outwards with no wall on the inner side.]]
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thumb|Two ravelins (top left of image) in Goes, The Netherlands thumb|Ravelin in the Dutch town of Bergen op Zoom thumb|300px|Ravelin protecting the entrance of Fort McHenry, [[Baltimore, Maryland]] thumb|The Moers fortifications, designed by [[Simon Stevin, where ravelins appear as triangular shapes surrounded by water, with wall (shown in dark green) facing outwards with no wall on the inner side.]]
A ravelin is a triangular fortification or detached outwork, located in front of the innerworks of a fortress (the curtain walls and bastions). Originally called a demi-lune, after the lunette, the ravelin is placed outside a castle and opposite a fortification curtain wall.