Where it is joined by the Moma river from the southeast, the Indigirka reaches the Momo-Selennyakh Depression, a wide intermontane basin and the middle course of the river begins, where its valley expands. Turning northwards, the Indigirka cuts deeply across the Moma Range and flows northeastwards meandering across the Aby Lowland and widening to 500 m. After flowing between the neck formed by the eastern end of the Polousny Range and the western end of the Ulakhan-Chistay Range, it flows north with the Kondakov Plateau to the est across the Yana-Indigirka Lowland, part of the greater East Siberian Lowland. Further north, where the terrain becomes completely flat, the Indigirka divides into branches 130 km from the mouth, forming a 5.500 km² wide delta. Its waters end up in the Kolyma Bay, East Siberian Sea.