The River Forth (Gaelic: Uisge For or Abhainn Dhubh, meaning "black river"), 47 km (29 miles) long, is the major river draining the eastern part of the central belt of Scotland.
The Forth rises in Loch Ard in the Trossachs, a mountainous area some 30 km (19 miles) west of Stirling. It flows roughly eastward, through Aberfoyle, joining with the Duchray Water and Kelty Water, and out over the flat expanse of the Flanders Moss.
It is then joined by the River Teith (which itself drains Loch Venachar, Loch Lubnaig, Loch Katrine, and Loch Voil) and the River Allan, before meandering through the ancient city of Stirling.
At Stirling the river widens and becomes tidal, and it is here that the last (seasonal) ford of the river exists. From Stirling, the Forth flows east over the Carse of Stirling and past the towns of Cambus (where it is joined by the river Devon), Alloa and Airth. Upon reaching Kincardine the river begins to widen into an estuary, the Firth of Forth.
The River Teith is a branch of the River Forth in Scotland. Originating in Callander it is joined by the River Leny and the Eas Ghobain it flows through Deanston and Doune before joining the Forth near Stirling.
The Deanston Distillery near Doune uses the Teith as a water supply for the manufacture of of its world famous Deanston Malt whisky.
The Teith is renowned for its fishing and for the splendid arched bridge ½ mile southwest of Doune.
Confluence of Ardoch with Teith, 3 km downstream from Doune
The 'Brig o' Teith' was constructed by Robert Spittal, a Royal tailor in 1535.
Many believe that the Forth is in fact a tributary of the Teith and that as the river flows past Edinburgh into the North Sea it should be referred to as the Firth of Teith.