Just 3.8 kilometers apart in the Bering Strait, Big Diomede and Little Diomede form one of the closest points between the United States and Russia. Big Diomede belongs to Russia; Little Diomede to the U.S. On a clear Arctic day, the other country is plainly visible across the water—close enough to feel reachable, yet politically unreachable. The International Date Line runs between the islands, placing them nearly 21 hours apart in time. Big Diomede is often called “Tomorrow Island,” while Littl