Ham is a small village to the south of Cergy

Cergy

Cergy is a commune in the northwestern suburbs of Paris, France. It is located from the center of Paris, in the "new town" of Cergy-Pontoise, created in the 1960s, of which it is the central and most populated commune....

. The village used to be part of the Sergentery and then commune of Neuville-sur-Oise

Neuville-sur-Oise

Neuville-sur-Oise is a commune in the northwest suburbs of Paris, France. It is located in the "new town" of Cergy-Pontoise, created in the 1960s....

 but has since been amalgamated in the commune of Cergy.

It is situated on the southern side of the River Oise

Oise River

The River Oise is a right tributary of the River Seine, flowing for 302 km in Belgium and France. Its source is in the Belgian province Hainaut, south of the town Chimay. It crosses the border with France after about 20 km. It flows into the Seine in Conflans-Sainte-Honorine, near Paris...

 and is linked to Cergy by a one way bridge. The area is rather flat as it is inside the last meander

Meander

A meander in general is a bend in a sinuous watercourse. A meander is formed when the moving water in a stream erodes the outer banks and widens its valley. A stream of any volume may assume a meandering course, alternately eroding sediments from the outside of a bend and depositing them on the...

of the river.

On its territory is the outdoor leisure centre Base de Loisirs de Cergy-Neuville.