Oise (river)

The Oise is a major river in France and Belgium. It is a left-bank tributary of the Seine, joining the Seine northwest of Paris. The Oise rises in the Belgian province of Hainaut, south of Chimay. It flows through northern France, passing through the departments of Aisne and Oise, from which it takes its name.

The Oise is navigable for a significant portion of its length, forming an important inland waterway. It is connected to the Canal de l'Oise à l'Aisne, which provides a link to the Meuse and Rhine river systems. This connectivity is crucial for commercial transport. The river has played a vital role in the economic development of the regions it traverses.

Notable towns and cities situated along the Oise include Compiègne, Creil, and Pontoise. The river's valley is characterized by fertile agricultural land and historical towns. It has also been the site of numerous battles and historical events throughout French history, due to its strategic location and importance as a transportation route.

The Oise has a drainage basin covering approximately 17,000 square kilometers. Its major tributaries include the Aisne, the Thérain, and the Nonette. The river's flow regime is influenced by rainfall and snowmelt, resulting in seasonal variations in water levels. Environmental concerns related to the river include water quality, pollution from agricultural runoff and industrial activity, and the impact of navigation on the river's ecosystem.