The Selle (French pronunciation: [sɛl] ^ⓘ; also spelt Celle in the Oise) is a river of Hauts-de-France, France. It is 39.2 km (24.4 mi) long.^[1] Rising at Catheux, just north of Crèvecœur-le-Grand, Oise, it flows past Conty, Saleux, Salouël and Pont-de-Metz before joining the Somme at Amiens.

The Selle
The Selle (or Celle) at Croissy-sur-Celle
Location
Country	France
Physical characteristics
Source
• location	Catheux
Mouth	Somme
• location	Amiens
• coordinates	49°54′25″N 2°16′50″E / 49.90694°N 2.28056°E / 49.90694; 2.28056
Length	39 km (24 mi)
Basin size	610 km2 (240 sq mi)
Discharge
• average	4.5 m3/s (160 cu ft/s)
Basin features
Progression	Somme→ English Channel

In many places along its course, the river widens to form or fill lakes, much appreciated by anglers and gravel extractors. Several water-powered mills can still be seen including a paper-mill at Prouzel. Brown trout thrive in the clear waters of the river.

• 
  The watermill between Fontaine-Bonneleau and Croissy-sur-Celle
• 
  The Mill at Croissy-sur-Celle