The islands separate the Banda Sea and the Arafura Sea.

The islands separate the Onega Bay from the main volume of the White Sea.

The island separates the north and south entrances of the Fly River.

The closest island is Rapa Iti, 75 km further northwest, but separated from it by an ocean depth of more than 1,500 meters.

The island of Saaremaa (Estonia) partially separates it from the rest of the Baltic Sea.

Those islands separate the sound from the Gulf of Mexico.

The island separates the weir stream from the navigation channel to the lock.

Both islands separated again at the beginning of the Holocene.

The island separated from the mainland (about 8000 years ago), at the end of the last Ice Age.

The island has extensive mangrove forest flats, partially separated by saltwater channels.