Which french industrial city is a gateway to Europe?

The French industrial city that is considered a gateway to Europe is Lille. It is located in the Hauts-de-France region of northern France, close to the Belgian border. Lille is a major transportation hub, with direct train connections to Paris, London, Brussels, and other European cities. The city also has a large international airport, Lille-Lesquin Airport. Lille is home to a number of important industries, including automotive, food processing, and textiles. It is also a major center for education and culture, with several universities and museums.