The Thal'Tharin River was a body of water on the planet Romulus.
History and specifics[]
It was located in the northern area of the continent of Brel'Kar. It flowed from the Sea of Vrekess and the Sherelak Sea, through the Tallesreld and into the Havrelar Sea. (Last Unicorn RPG - The Way of D'era: The Romulan Star Empire module: The Romulans)