Cumbric place names are found in Scotland south of the firths of Forth and Clyde. Brittonic names north of this line are Pictish. They are also found commonly in the historic county of Cumberland and bordering areas of Northumberland. They are less common in Westmorland and Durham, with some in Lancashire and the adjoining areas of North Yorkshire. Approaching Cheshire, late Brittonic placenames are probably better described as being Welsh rather than Cumbric. As noted below, however, any clear distinction between Cumbric and Welsh is difficult to prove. Many Brittonic place-names remain in northern England, which should not be described as Cumbric because they originated from a period before Brittonic split into its daughter dialects e.g. Welsh, Cornish, Breton and – arguably – Cumbric.