Many thanks to Friars Carse Hotel for facilitating this camera's location and to the Nith District Salmon Fishery Board for capitally funding its installation.. The River Nith is the seventh longest river in Scotland. It rises in East Ayrshire in the Carsphairn hills, and for the majority of its course flows through Dumfries and Galloway, before spilling into the Solway Firth at Dumfries. The territory through which the river flows is called Nithsdale (historically known as 'Stranit' from Scottish Gaelic: Strath Nid, 'valley of the Nith'). The River Nith is arguably the most productive of the Solway Rivers offering excellent sport for anglers of all abilities and experience.