Tora Bora (, Black Cave), known locally as Spin Ghar (, White Mountain), is a cave complex, part of the White Mountains (Safed Koh) of eastern Afghanistan. It is situated in the Pachir Aw Agam District of Nangarhar, approximately west of the Khyber Pass and north of the border of the Federally Administered Tribal Areas in Pakistan. Tora Bora was known to be a stronghold location of the Taliban, used by military forces against the Soviet Union during the 1980s. Tora Bora and the surrounding Safed Koh range had natural caverns formed by streams eating into the limestone.