There are two islands in the San Juan Archipelago named Skull Island. One (48.46, -122.83) is located in Mud Bay, part of Lopez Sound, between the Sperry Peninsula of Lopez Island

Lopez Island

Lopez Island is the third largest of the U.S. San Juan Islands. Lopez Island is in land area. The 2000 census population was 2,177.-History:...

, and Fortress Island. The other, Skull Island Marine State Park (48.6394, -122.985) is a 2½ acre (1.0 ha), uninhabited island in Massacre Bay, just off the coast of Orcas Island

Orcas Island

Orcas Island is the largest of the San Juan Islands, which are located in the northwestern corner of Washington state in San Juan County, Washington.-History:...

. This island was named because of the skulls and bones that were found there after a band of Lummi

Lummi

The Lummi , governed by the Lummi Nation, are a Native American tribe of the Coast Salish ethnolinguistic group in western Washington state in the United States...

 were killed by raiding Haida in 1858.