The Nonette is a

tributary A tributary, or an ''affluent'', is a stream or river that flows into a larger stream (''main stem'' or ''"parent"''), river, or a lake. A tributary does not flow directly into a sea or ocean. Tributaries, and the main stem river into which they ...

to the river

Oise Oise ( ; ; ) is a department in the north of France. It is named after the river Oise. Inhabitants of the department are called ''Oisiens'' () or ''Isariens'', after the Latin name for the river, Isara. It had a population of 829,419 in 2019.< ...

in northern

France France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlan ...

. It is long. Its source is in Nanteuil-le-Haudouin, from which it flows west through

Senlis Senlis () is a commune in the northern French department of Oise, Hauts-de-France. The monarchs of the early French dynasties lived in Senlis, attracted by the proximity of the Chantilly forest. It is known for its Gothic cathedral and other ...

and

Chantilly Chantilly may refer to: Places France *Chantilly, Oise, a city ** US Chantilly, a football club *Château de Chantilly United States * Chantilly, Missouri, an unincorporated community * Chantilly (Charlotte neighborhood), North Carolina ...

, and joins the Oise near

Saint-Leu-d'Esserent Saint-Leu-d'Esserent () is a Communes of France, commune in the Oise Departments of France, department in northern France. Saint Leu is notable for of mushroom quarries under the Thiverny plateau. History During World War II, the quarries were ...

. The river has relatively high

turbidity Turbidity is the cloudiness or haziness of a fluid caused by large numbers of individual particles that are generally invisible to the naked eye, similar to smoke in air. The measurement of turbidity is a key test of both water clarity and wa ...

and its brownish water has a modest velocity due to the slight gradient of the watercourse; pH levels have been measured at 9.25 or quite

alkaline In chemistry, an alkali (; from the Arabic word , ) is a basic salt of an alkali metal or an alkaline earth metal. An alkali can also be defined as a base that dissolves in water. A solution of a soluble base has a pH greater than 7.0. The ...

Hogan, C. Michael, ''Water quality of freshwater bodies in France'', Lumina Tech Press, Aberdeen (2006) near the Château d'

Ermenonville Ermenonville () is a commune in the Oise department, northern France. Located near Paris, Ermenonville is notable for its park named for Jean-Jacques Rousseau by René Louis de Girardin. Rousseau's tomb was designed by the painter Hubert Robe ...

and

electrical conductivity Electrical resistivity (also called volume resistivity or specific electrical resistance) is a fundamental specific property of a material that measures its electrical resistance or how strongly it resists electric current. A low resistivity in ...

of the waters have tested at 81 micro-siemens per centimetre.

References

Rivers of France Rivers of Hauts-de-France Rivers of Oise {{France-river-stub