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The River Forth has two headstreams, Duchray Water and the Avondhu, which rise on the northeast side of Ben Lomond, flowing eastward through Stirlingshire to unite east of Aberfoyle. From there, it winds for 39 miles to Stirling. Below that town, the river follows a tortuous course for 12 miles through a section called "The Links," which ends at Alloa in Clackmannanshire. The Firth of Forth, its estuary, extends 48 miles from Alloa to the North Sea.