The Exxon Valdez oil spill was a major environmental disaster that occurred in Alaska's Prince William Sound on March 24, 1989. The spill occurred when Exxon Valdez, an oil supertanker owned by Exxon Shipping Company, bound for Long Beach, California, struck Prince William Sound's Bligh Reef, 6 mi (9.7 km) west of Tatitlek, Alaska, at 12:04 a.m. The tanker spilled more than 10 million US gallons (240,000 bbl) (or 37,000 tonnes) of crude oil over the next few days.