The tomb is located in a rocky islet in the waters off Bonggil-ri, Yangbuk-myeon in Gyeongju. The islet is called Daewangam (the Rock of the Great King) because the remains of King Munmu were cremated and his ashes laid to rest here in accordance with his will. It stretches north and south, and it is surrounded by smaller rocks. There is a pool at the center of Daewangam, but because it sits in a cross-shaped waterway, it remains placid even as the waves strike around it. Beneath the water’s surface is a wide flat rock 3.7 meters long and 2.06 meters wide from north to south. It is believed that the remains of King Munmu are buried under the rock.