The Victoria Island structure is a 5.5 km (3 mi) bowl-shaped structure buried in the shale sediments of the Sacramento-San Joaquin River Delta, 12 miles (19 km) west of Stockton, California.

[2] Discovered during oil exploration and reported at the Lunar and Planetary Science Conference in Houston, Texas, in March 2007, it is thought to be a buried impact crater formed between 37 and 49 million years ago.

[3][4] Victoria Island, which the structure is named for, is in the San Joaquin River Delta at approximately 37°53′24″N 121°32′06″W / 37.890°N 121.535°W / 37.890; -121.535.

[5] The current publications do not list a more precise location for the impact structure than the island.

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