The Scottish watershed is the drainage divide in Scotland that separates river systems that flow to the east into the North Sea from those that flow to the west and north into the Atlantic Ocean. At a point on the summit of Ben Lomond for example, looking west all water flows to the Firth of Clyde, and looking east all water flows into the Firth of Forth. Similarly Cumbernauld is a point on this line and arguably its Gaelic name has, for hundreds of years, reflected this fact. There is some dispute however about interpretation of the Gaelic phrase. The line joining all such points in Scotland is the Scottish watershed.