| Sundrun | |
| Pushpin Map: | Russia Sakha Republic |
| Pushpin Map Caption: | Location in Sakha, Russia |
| Source1 Location: | Unnamed lake |
| Source1 Coordinates: | 69.8639°N 151.4775°W |
| Source1 Elevation: | 165m (541feet) |
| Subdivision Type1: | Country |
| Subdivision Name1: | Russia |
| Subdivision Type2: | Location |
| Subdivision Name2: | Sakha |
| Length: | 314km (195miles) |
| Mouth Coordinates: | 70.8123°N 152.5582°W |
| Mouth Elevation: | 0m (00feet) |
| Basin Size: | 4170km2 |
The Sundrun (Russian: Сундрун) is a river in the Sakha Republic (Yakutia) of the Russian Federation. It is long, and has a drainage basin of .
It has its sources in the Ulakhan-Sis Range and flows roughly northeastwards across the Kondakov Plateau.[1] Leaving the uplands, it crosses the Yana-Indigirka Lowland tundra, part of the greater East Siberian Lowland. It flows first in a roughly eastern and then, more than halfway through its course, in a northern direction. Its mouth is in the East Siberian Sea at the western end of the Kolyma Bay.[2] The Sundrun River freezes up in early October and remains icebound until June.
The main tributary of the Sundrun is the 235km (146miles) long Maly Khomus-Yuryakh (Малый Хомус-Юрях) from the right.
The Kytalyk Wetlands, located between the Sundrun and the Khroma, are an ecologically important area, providing a favorable habitat for many rare animals. It is practically uninhabited and full of lakes and marshes. Siberian cranes are abundant in the Sundrun River wetlands.[3]
The lesser white-fronted goose,[4] Brent goose, Bewick's swan and the spectacled eider are also found in the Khroma-Sundrun Interfluvial Area.[5]
There is also a wild reindeer population in the Sundrun basin.[6]
The "Sundrun Kekurs" (Сундрунские кекуры) are the natural kigilyakh-type rock formations of the Ulakhan-Sis Range and Suor Uyata, located in the upper course of the river.[7]