The North Esk is formed in the southern Grampians by the meeting of the Water of Mark and the Water of Lee in Angus. It flows east and south east through Glen Esk, before flowing through the southern end of the Howe o the Mearns through rich farmland to enter the North Sea 4 miles (6 km) north of Montrose. Its chief tributaries are the Water of Tarf, Luther Water, West Water and Craick Water and its total length is 29 miles (47 km). From a point 2½ miles (4 km) north of Edzell until it meets the sea, the North Esk forms the boundary between Angus and Aberdeenshire.
Salmon are likely to be up past the ?Loups of the Burn?, a series of falls about fifteen miles below Loch Lee, and into the upper beats by April. The lower river flows through a series of long holding pools, giving excellent fishing on the lower beats . The North Esk is very much a spate river, requiring rain to give good sport in the summer months.
Sea trout also run the river from late may to august and may also be caught following a summer spate, perhaps on a small silver stoat tube fly fished on a single handed rod of about ten feet.
The North Esk season runs from 16th Feb to 31st Oct Incl.