The Athabasca Oil Sands (also known colloquially as the Athabasca Tar Sands although there is no actual tar) are large deposits of bitumen, or extremely heavy crude oil, located in northeastern Alberta, Canada - roughly centered around the boomtown of Fort McMurray. These oil sands, hosted in the McMurray Formation, consist of a mixture of crude bitumen (a semi-solid form of crude oil), silica sand, clay minerals, and water. The Athabasca deposit is the largest reservoir of crude bitumen in the world and the largest of three major oil sands deposits in Alberta, along with the nearby Peace River and Cold Lake deposits. Together, these oil sand deposits lie under 141,000 square kilometres (54,000 sq mi) of sparsely populated boreal forest and muskeg (peat bogs) and contain about 1.7 trillion barrels (270x109 m3) of bitumen in-place, comparable in magnitude to the world's total proven reserves of conventional petroleum.

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