Heavy oil deposits and bitumen are found in a wide variety of locations
The world's current heavy oil reserve estimates total approximately 1.1 trillion barrels of oil. The Western Hemisphere has about 70% of this resource's technically recoverable reserves. Other estimates put the total considerably higher. Indeed, these higher estimates are gaining credence as new recovery technologies being developed promise to yield increased recovery, forcing a shift from primary (cold) production to more thermal and non-thermal methods.
Source: US Geological Survey