a long artificial mound of stone or earth; built to hold back water or to support a road or as protection

a fortification 37 miles long across the narrowest part of southern Scotland (between the Firth of Forth and the Firth of Clyde); built in 140 to mark the frontier of the Roman province of Britain

a fortification 1,500 miles long built across northern China in the 3rd century BC; it averages 6 meters in width

defensive structure consisting of walls or mounds built around a stronghold to strengthen it

surround with a wall in order to fortify

the outer defensive wall that surrounds the outer courtyard of a castle

a rampart built around the top of a castle with regular gaps for firing arrows or guns

an earthen rampart

sloping or horizontal rampart of pointed stakes

a solid section between two crenels in a crenelated battlement

a fortification 37 miles long across the narrowest part of southern Scotland (between the Firth of Forth and the Firth of Clyde); built in 140 to mark the frontier of the Roman province of Britain

a fortification 1,500 miles long built across northern China in the 3rd century BC; it averages 6 meters in width

defensive structure consisting of walls or mounds built around a stronghold to strengthen it