Shelonsky Islands – is a small archipelago in the Laptev Sea. They are situated in the coastal plains of the Yana Bay, to the east of the Yana Delta. Like the continental Yana-Indigirka Plain, which is separated from the islands by a narrow 1.5-km channel, the islands have flat lowland and extremely swampy relief. They are divided by a number of narrow shallow small rivers. Some of the islands are nameless and they are mostly formed by the alluvia of the Yana, Suruktyakh, Chandan, and Muksunuokha rivers. The archipelago is an administrative division of the Sakha Republic, Yakutia. The largest of the islands is East Shelonsky Island, located at the northern coast of Manyko Peninsula. It is 17 km long and 7.2 km wide (max). The island has a lot of small lakes and is narrowed toward its eastern end. The fairly deep Shelyakhskaya Bay is located to the east of this island. The West Shelonsky Island is of 2.5 km in diameter. It is separated from the East Shelonsky Island by a 2-km channel. The South Shelonsky Island is 20 km to the west from the previous ones, with the length of 3 km and the width of 0.7 km.