The City of Northern France is a region that includes three major cities: Lille (5 letters), Rouen (5 letters), and CAEN (4 letters). Lille is the largest city in the region and is located near the border with Belgium. Rouen is a port city on the River Seine and is known for its Gothic architecture. CAEN is a university town and is home to the Normandy beaches, which were the site of the D-Day landings during World War II.