Estray Island

Estray Island, or simply Estray, was one of the Orkney islands.

History
The Viking pirate Magnus Redhand was reputed to have buried his treasure, plunder from his days sailing on the Mediterranean Sea, on Estray during the 10th century.

Archaeologist René Emile Belloq visited Estray at some point during his career but achieved little beyond angering the locals with his methods of excavation.

Estray was also home to Ian Soames, a lighthouse keeper whose role concealed his machinations as one of Seven Sorcerers of legend who sought to bring destruction upon the world. To that end, in 1937, he hired a thief called Amanda Knight to steal the Eye of Shamash and a Sumerian clay tablet containing instructions of how to defeat them from the Connecticut branch of the National Museum. Her theft, which was partially successful, brought Soames to the attention of Indiana Jones who eventually defeated the sorcerer.

Behind the scenes
There is no actual Estray Island, also called Estry, in the Orkney archipelago which appeared in the Double Play! story arc of Marvel's The Further Adventures of Indiana Jones. There does exist the island of Westray (and Papa Westray) which simply derives its name from the Old Norse for "west island" but it's unclear whether or not the comic Estray is a misspelling or a similar-sounding name conceived as part of the comic's worldbuilding.