That Dam (Lao ທາດດຳ, meaning Black Stupa) is a large stupa located in Vientiane, Laos. The stupa is located in the middle of the roundabout between Chantha Khoumane road and Bartholonie road.
Many Laotians believe it is inhabited by a seven-headed nāga who tried to protect them from an invasion by the Siamese army in 1827.
17°57′58″N 102°36′40″E / 17.9660°N 102.6111°E