French Vexin Regional Natural Park

Hardricourt is a commune in the Yvelines department in the Île-de-France region in north-central France.The castle of Hardricourt was between 1970 and 2011 property of Jean-Bedel Bokassa, from 1966 dictator and between 1977 and 1979, the year he was overthrown, self-appointed emperor of the Central African Republic.

Aubette de Meulan is a French river that begins at Avernes in Val-d'Oise, flows through Vigny, and empties into the Seine in Meulan-en-Yvelines. One commune is named after this river: Tessancourt-sur-Aubette (Yvelines).It is 20 km long.

Oinville-sur-Montcient is a commune in the Yvelines department in the Île-de-France region in north-central France.

Seraincourt is a commune in the Val-d'Oise department in Île-de-France in northern France.

Meulan-en-Yvelines ([mœ.lɑ̃.n‿ɑ̃.n‿i.vlin]; formerly Meulan) is a commune in the Yvelines department in the Île-de-France region in north-central France. It hosted part of the sailing events for the 1900 Summer Olympics held in neighboring Paris, and would do so again twenty-four years later.