The River Ith was the longest river in Tethyr. It began in the Snowflake Mountains and Omlarandin Mountains and flowed west across Tethyr, passing through the capital city of Darromar (formerly Ithmong) and into the sea at the Sword Coast a few miles west of Myratma. The river formed the southern border of the Purple Marches, Crown Lands, and Golden Marches and the northern border of Ankaram Duchy and Suretmarch. The river was named after Clan Ithal, which provided Tethyr with its first dynasty. Before -293 DR, it had been named the Wurlur.