Off its southern tip lies a much smaller 2 km long island of similar characteristics.

The area where Muostakh Island lies, is subject to severe Arctic weather with frequent gales and blizzards.

Administratively Muostakh Island belongs to the Sakha Republic (Yakutia) of the Russian Federation.

[1] Geologically Muostakh Island is the remainder of an ancient great plain that was part of the Siberian continental about two thousand years ago.

Nowadays its northern headland is subject to spectacular sea erosion, receding at a rate of 6 m a year.