Longueuil is a city in the province of Quebec, Canada. It is located on the south shore of the Saint Lawrence River, directly across from Montreal. Longueuil is part of the greater Montreal metropolitan area and is one of the most populous suburbs of Montreal.

The city is known for its diverse neighborhoods, parks, and cultural amenities. It has a mix of residential, commercial, and industrial areas. Longueuil is also home to various institutions, including the Université de Sherbrooke’s Longueuil campus.

The city is well-connected to Montreal through various transportation options, including bridges and public transit services. The Jacques Cartier Bridge and the Victoria Bridge are two important structures linking Longueuil to Montreal.