 It runs approximately West to East through Normandy north of Granville and Villedieu-les-Poêles and divides Manche in two linguistically and separates Calvados and Orne along with Eure; then it curves progressively to the North and ends up approximately South to North in Picardy, where the line runs with the Amiénois and Thiérache, up to the west of Rebecq, Beaumont and Chimay in Belgium where it separates Picard from Walloon.Another effect of the palatalizations a bit further to the north but quite parallel was this