Someshwari River (also spelt Someswari) (Bengali: সোমেশ্বরী নদী), known as Simsang River in the Indian state of Meghalaya, is a major river in the Garo Hills of Meghalaya and Netrakona District of Bangladesh. It divides the Garo Hills into two parts.
In Bangladesh it flows through the Susang-Durgapur and other areas of Netrakona District till it flows into the Kangsha River. A branch of the river flows towards Kalmakanda and meets the Balia River. Another branch of the river flows into the haor areas of Sunamganj District and flows into the Surma River It is one of Bangladesh's trans-boundary rivers.
- Mazumdar, Kedarnath, Moymonshingher Itihash O Moymonsingher Biboron, 2005, (in Bengali), p. 152, Anandadhara, 34/8 Banglabazar, Dhaka.
- "Map of Sunamganj District". Banglapedia. Asiatic Society of Bangladesh. Archived from the original on 2007-12-12. Retrieved 2007-12-02.
- Sarkar, Sanjay (2012). "Netrokona District". In Islam, Sirajul; Jamal, Ahmed A. (eds.). Banglapedia: National Encyclopedia of Bangladesh (Second ed.). Asiatic Society of Bangladesh.
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