Dilmun or Telmun was an ancient Semitic speaking country mentioned throughout the history of Mesopotamia from the 3rd millennium BC onwards. It is regarded as one of the oldest civilizations in the Middle East. Based on textual evidence, it is located in the Persian Gulf on a trade route between Mesopotamia and the Indus Valley Civilisation, close to the sea and to artesian springs.
Dilmun was an important trading centre which at the height of its power controlled the Persian Gulf trading routes. According to some modern theories, the Sumerians regarded Dilmun as a sacred place, though this is never stated in any known ancient text. Dilmun was mentioned by the Mesopotamians as a trade partner, a source of copper, and a trade entrepôt.
The scholarly consensus is that Dilmun encompassed Bahrain, Kuwait, Qatar and the coastal regions of the Eastern Province of Saudi Arabia. This area is certainly what is meant by references to "Dilmun" among the lands conquered by king Sargon of Akkad and his descendants.
It is often misreported that the Sumerians described Dilmun as a garden paradise in the Epic of Gilgamesh. The Sumerian tale of the garden paradise of Dilmun may have been an inspiration for the Garden of Eden story. However, this is entirely modern speculation since the home of Utnapishtim is never indicated as Dilmun, nor does the name appear in any Gilgamesh literature.
Dilmun is a region of high albedo on Titan, Saturn's natural satellite.