The Gochang, Hwasun and Ganghwa Dolmen Sites are the location of hundreds of stone dolmens which were used as grave markers, and for ritual purposes during the first millennium BCE when the Megalithic Culture was prominent on the Korean Peninsula. The sites were designated as a World Heritage Site by UNESCO in 2000. The Korean Peninsula is home to over 35,000 dolmens, accounting for approximately 40% of the world's total; the Gochang, Hwasun, and Ganghwa sites are themselves home to over 1,000 dolmens.

A dolmen or portal tomb is a type of single-chamber megalithic tomb, usually consisting of two or more upright megaliths supporting a large flat horizontal capstone or "table". Most date from the Late Neolithic period and were sometimes covered with earth or smaller stones to form a tumulus. Small pad-stones may be wedged between the cap and supporting stones to achieve a level appearance. In many instances, the covering has eroded away, leaving only the stone "skeleton".