| Ternoise | |
|---|---|
 | |
   | |
| Location | |
| Country | France |
| Physical characteristics | |
| Source | |
| • location | Pas-de-Calais |
| Mouth | |
• location | Canche |
• coordinates | 50°22′53″N 2°0′41″E / 50.38139°N 2.01139°E |
| Length | 41.4 km (25.7 mi) |
| Basin size | 342 km2 (132 sq mi) |
| Discharge | |
| • average | 4.45 m3/s (157 cu ft/s) |
| Basin features | |
| Progression | Canche→ English Channel |
The river Ternoise (French pronunciation: [tɛʁnwaz]; Dutch: Ternaas) is one of the small chalk streams that flow from the plateau of the southern Boulonnais and Picardy, via the Canche, into the English Channel. The basin of the Ternoise extends to 342 square kilometres (132 sq mi) and lies in the southern end of the département of Pas-de-Calais. It is one of the rivers of the Seven Valleys tourist area and gives its name to the Ternois area.