The Avre is a river in Picardie

Picardie

Picardy is one of the 27 regions of France. It is located in the northern part of France.-History:The historical province of Picardy stretched from north of Noyon to Calais, via the whole of the Somme department and the north of the Aisne department...

 and is the principal tributary, from the left side, of the Somme. At 66 kilometres long, it drains a relatively important basin of 1,150 km² but only flows at best 5,1 m³/s near its confluence at Longueau

Longueau

Longueau is a commune in the Somme department in Picardie in northern France.-Geography:Longueau is situated southeast of Amiens, a suburb just by the airport, on the N29 road-Population:-Places of interest:The town was once a railway centre...

.

Its principal tributaries are: the Noye

Noye

The Noye is a river in the Picardie region of northern France.The Noye is located in the northern part of the Picard plateau. It is the left tributary of the Avre river, which is itself a left tributary of the Somme River. The Noye starts near the commune of Vendeuil-Caply and extends to a length of...

, joining at Boves

Boves

Boves is a comune in the Province of Cuneo in the Italian region Piedmont, located about 80 km south of Turin and about 6 km south of Cuneo...

, the Trois Doms joining at Pierrepont-sur-Avre

Pierrepont-sur-Avre

Pierrepont-sur-Avre is a commune in the Somme department in Picardie in northern France.-Geography:The commune is situated on the D935 road, some southeast of Amiens, on the banks of the Avre River.-Population:-External links:*...

, the Brache joing at Braches

Braches

Braches is a commune in the Somme department in Picardie in northern France.-Geography:Braches is situated on the D256 road, some southeast of Amiens, on the banks of the Avre river.-Population:-External links:*...

 and the Luce river at Berteaucourt-les-Thennes

Berteaucourt-lès-Thennes

Berteaucourt-lès-Thennes is a commune in the Somme department in Picardie in northern France.-Geography:The commune is situated on the D935 road, close to the banks of the Somme some southeast of Amiens...

.