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Exxon Valdez oil spill, massive oil spill that occurred on March 24, 1989, in Prince William Sound, an inlet in the Gulf of Alaska, Alaska, U.S. The incident happened after an Exxon Corporation tanker, the Exxon Valdez, ran aground on Bligh Reef during a voyage from Valdez, Alaska, to California. Delayed efforts to contain the spill and naturally strong winds and waves dispersed nearly 11,000,000 gallons (41,640 kiloliters) of North Slope crude oil across the...