| Shimna River | |
|---|---|
.JPG) Shimna River in Tollymore Forest Park, September 2010 | |
  Location of mouth within Northern Ireland | |
| Location | |
| Country | Northern Ireland |
| Region | County Down |
| Physical characteristics | |
| Source | |
| • location | Mourne Mountains on the slopes of Ott Mountain |
| • elevation | 430 m (1,410 ft) |
| Mouth | |
• location | Dundrum Bay, Irish Sea |
• elevation | 5 m (16 ft) |
| Length | 11.77 km (7.31 mi)[1] |
| Basin features | |
| Tributaries | |
| • left | Trassey River Spinkwee River Tullybrannigan River |
| • right | Burren River |
The Shimna River (Irish: Simhné, meaning river of bulrushes[2]) is a river in County Down, Northern Ireland. It rises on the slopes of Ott Mountain, in the Mourne Mountains, and enters the Irish Sea at Newcastle, on Dundrum Bay. It is acidic and nutrient-poor, as a result of which its most common flora are mosses and liverworts, including the rare Portuguese feather-moss and Holt's mouse-tail moss. Its principal fish are salmon and sea trout, and it is managed by the Shimna Angling Club. The river is an Area of Special Scientific Interest (ASSI).
The Shimna has a history of flooding; the most serious recent flooding was in 2008. There have also been incidents of pollution, and there were serious fish kills in 2004, 2006 and 2009.
- ^ "Shimna River ASSI". Retrieved 30 October 2020.
- ^ Joyce, P.W (1910). The origin and history of Irish names of places (1910), Volume II. London Longmans, Green. p. 334.