Esk (Lothian / Scotland)

The River Esk (Brythonic: Isca (water), Scottish Gaelic: Easg (water)), also called the Lothian Esk, is a river that flows through Midlothian and East Lothian, Scotland.
It initially runs as two separate rivers: the North Esk and the South Esk.

Source: Wikipedia https://en.wikipedia.org/wiki/River_Esk,_Lothian