How many Diomede Islands are there?

The Diomede Islands consist of two rocky, mesa-like (an isolated, flat-topped elevation, ridge or hill, which is bounded from all sides by steep escarpments and stands distinctly above a surrounding plain) islands:

The Russian island of Big Diomede (part of Chukotka), also known as Imaqłiq, Inaliq, Nunarbuk or Ratmanov Island.

The U.S. island of Little Diomede (part of Alaska) or Iŋaliq, also known as Krusenstern Island.

The Diomede Islands are located in the middle of the Bering Strait between mainland Alaska and Siberia. If marginal seas are considered, then they are the northernmost islands within the entire Pacific Ocean. To the north is the Chukchi Sea and to the south is the Bering Sea. Fairway Rock, 9.3 kilometres (5.8 mi) to the southeast, is also Alaskan, but generally not seen as part of the Diomede Islands.

Because they are separated by the International Date Line, Big Diomede is almost a day ahead of Little Diomede, but not completely; due to locally defined time zones, Big Diomede is only 21 hours ahead of Little Diomede (20 in summer). Because of this, the islands are sometimes called Tomorrow Island (Big Diomede) and Yesterday Island (Little Diomede).