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Largest oil spills
Note: the extent of the ongoing Deepwater Horizon oil spill has not been well determined as of this writing.

One tonne of crude oil is roughly equal to 308 US gallons or 7.33 barrels approx.; 1 oil barrel is equal to 35 imperial or 42 US gallons. Original estimates for the spill where as high as 11,000,000 barrels, however these numbers were corrected downward by subsequent, more detailed studies.