Saint Matthew island is right in the middle of the Bering Sea, between Siberia and Alaska. Classified as a National Wildlife Refuge by the United States, this island covered in wet tundra corresponds to the northern boundary of the polar bear’s range during winter. It is home to many birds, including the McKay's bunting, an endemic species whose population is estimated at 6,000 individuals. We can also find Arctic foxes there. Although populated by the Aleut during prehistoric times Saint Matthew Island is uninhabited today.