The Roogagh River is one of the main tributaries for Lough Melvin. It flows through Garrison, a small village in County Fermanagh, Northern Ireland, 5 miles south of Belleek, at the eastern end of Lough Melvin.
The "Ground Bridge" on the Roogagh River at Tullybelcoo is a short active river cave. The passage is approximately 45m long and the Roogagh River flows through an outcrop of the Carboniferous Dartry Limestone. This is a unique karstic feature in Northern Ireland.
- "The Garrison Lowlands Geodiversity Profile". Northern Ireland Environment Agency. Retrieved 28 February 2009.
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