Aisne (river)

The Aisne is a river in northeastern France. It is a left tributary of the Oise river. It gave its name to the French department of Aisne. It was known in Roman times with its Celtic name of Axona.
Geography.
The Aisne river has a length of , and a drainage basin with an area of .
Course.
The source of the Aisne is in the "Forest of Argonne", in the Rembercourt-Sommaisne "commune" (Meuse), near the border with the Marne department, at an altitude of about . From here, the Aisne flows to the west.
The Aisne river flows through 2 regions and 5 departments. It flows through the following "communes", among others:
Finally, it flows into the Oise river in the city of Compiègne.
Main tributaries.
The main tributaries of the Aisne river are:
Left tributaries:
Right tributaries:
Hydrology.
Its average yearly discharge (volume of water which passes through a section of the river per unit of time) is at Trosly-Breuil in the Oise department.
The Aisne shows typical seasonal fluctuations. The highest levels of the river are in winter and spring, from December to May inclusive, with the highest level in February. They are followed by a rapid fall in the flow during the low water period that goes from July to October.