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Ternoise
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.

Geography

The 41.4-kilometre (25.7 mi) long river^[1] rises at Ligny-Saint-Flochel and passes through Saint-Pol-sur-Ternoise to join the river Canche at Huby-Saint-Leu, near to the town of Hesdin.

Towns and villages along the course

The Ternoise flows through the following places (all within the Pas-de-Calais department):

Ligny-Saint-Flochel, Roëllecourt, Saint-Michel-sur-Ternoise, Saint-Pol-sur-Ternoise, Gauchin-Verloingt, Hernicourt, Wavrans-sur-Ternoise, Monchy-Cayeux, Anvin, Teneur, Érin, Tilly-Capelle, Blangy-sur-Ternoise, Blingel, Rollancourt, Auchy-lès-Hesdin, Le Parcq, Grigny and Huby-Saint-Leu.

Tributaries

The Faux and the Eps are the only principal watercourses joining the Ternoise.

Hydrological Information

The Ternoise is a very uniform river. Seasonal flow fluctuations are not very marked, similar to the Canche or the Somme, its neighbours. The higher water flows occur at the end of winter and in the spring. Average flows vary between 3.44 m³ per second in September to 5.36 m³ per second in March.