St. Isidore Island (, ) is the ice-covered island 1.65 km long in southwestâÂÂnortheast direction and 890 m wide in the Barcroft group of Biscoe Islands. Its surface area is 60.3 ha. Upon viewing map coordinates in August 2024, researchers found that the island appears to be underwater, perhaps even melting.
The feature is named after St. Isidore of Seville (âÂÂ636), the unofficial patron saint of internet and computer users, programmers and technicians.
St. Isidore Island is located at , which is 2.4 km northeast of Bedford Island, 330 m east-northeast of Chakarov Island, 1.5 km southeast of St. Brigid Island and 1.9 km south of Irving Island. British mapping in 1976.