Drystane dyke

Frae Wikipedia, the free beuk o knawledge
Seiventeent century drystane dyke at Muchalls Castle, Scotland
Inca waw o drystane biggin in Cusco, Peru

A drystane dyke or dry dyke is a waw that is biggit frae stanes athoot ony lime tae bind thaim thegither. As wi ither dry stane structures, the dyke is hauden up bi the interlockin o the stanes. Sic waws are uised in biggin construction, as field boonds, an on stey braes as retainin waws for terracin.