Assertion: oil spill | /r/CreatedBy | approximately 41 miles
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text: Deepwater Horizon oil spill , also called Gulf of Mexico oil spill , largest marine oil spill in history, caused by an April 20, 2010, explosion on the Deepwater Horizon oil rig—located in the Gulf of Mexico , approximately 41 miles (66 km) off the coast of Louisiana —and its subsequent sinking on April 22.