Tobruk or Tobruck is a port city on Libya's eastern Mediterranean coast, near the border with Egypt. It is the capital of the Butnan District and …Tobruk or Tobruck is a port city on Libya's eastern Mediterranean coast, near the border with Egypt. It is the capital of the Butnan District and has a population of 120,000. Tobruk was the site of an ancient Greek colony and, later, of a Roman fortress guarding the frontier of Cyrenaica. Over the centuries, Tobruk also served as a waystation along the coastal caravan route. By 1911, Tobruk had become an Italian military post.