Down flow

It takes its source in a moorland at over 900 meters of altitude, in the high valley of Les Convers, (see: Renan

Renan, Switzerland

Renan is a municipality in the Jura bernois administrative district in the canton of Bern in Switzerland. It is located in the French-speaking Bernese Jura .-Geography:...

). It flows down the whole length of the valley of Saint-Imier

Saint-Imier

Saint-Imier is a municipality in the Jura bernois administrative district in the canton of Bern in Switzerland. It is located in the French-speaking Bernese Jura .Observatoire Astronomique de Mont-Soleil is located above the village....

, (Erguel

Erguel

Erguël is an ancient seigniory of the Roman Catholic Diocese of Basel, and under protectorate of Biel/Bienne, under military jurisdiction from 1335, in the now so called valley of St.-Imier, in the now Bernese Jura, Switzerland...

), leaving it through the gorge of Taubenloch

Taubenloch

Taubenloch, is a gorge located in the Canton of Bern, above Biel/Bienne in Switzerland. It crosses the first Jura Mountains mountain chain, as considered from the Swiss Plateau.-Location:...

, it flows across the city of Biel/Bienne

Biel/Bienne

Biel/Bienne is a city in the district of the Biel/Bienne administrative district in the canton of Bern in Switzerland.It is located on the language boundary and is throughout bilingual. Biel is the German name for the town, Bienne its French counterpart. The town is often referred to in both...

 into the Lake of Bienne, at the altitude of 429 meters, upon a stretch of 45 kilometres. It leaves it through the last leg of the Thielle

Thielle

The River La Thielle is a tributary to the Aare River, in the Swiss Seeland."La Thielle" results of the merging of the river Orbe and river Talent, Northeast of the little city of Orbe in the Swiss Canton of Vaud...

 river, merging into the Nidau-Büren channel

Nidau-Büren channel

Nidau-Büren Channel is a long channel that drains the waters of the Aare River out of the Lake of Biel/Bienne toward Solothurn. It was dug as an important part of the first Jura water correction.- Regulating dam :...

 (Aare river), just before the regulating dam Port

Regulating Dam Port, Seeland, Switzerland

thumb|500px|right|Map of the area following the construction of the canalDuring the first Jura water correction, a temporary dam had been built across the Nidau-Büren channel in order to maintain the water level in Lake Bienne...

 .

Tributaries

Its main tributaries are la Dou, la Raissette, le Terbez and l'Orvine.

History

On December 21, 1991, the river has provoked significant flooding along its course: ie in Sonceboz, its level had raised by a significant 1,10 meter, with 65 cubic meters of water per second.