Rouen is a city located in the Upper Normandy region of France, situated on the River Seine. It is the capital of the region and has a population of over 110, 000 people. Rouen is known for its Gothic architecture, including the Notre-Dame Cathedral, which was built in the 12th century. The city is also known for its historical importance, having been the site of Joan of Arc's execution in 1431. Rouen is an important river port and is often referred to as the 'River City on the Seine'.