Hello how may I help you? Geography help please. Sure. How can I help? What river runs through Montreal? The Montreal River. Wow that was fast. You're great! Thank you. Anything else I can help you with today? I dont think so. I'm going to recommend you to all my friends. I appreciate that! The river is 400 miles long and 54 feet wide in most areas. Thanks for the extra information. I'll talk to you whenever I need more help. Thank you. Have a nice night!