, ▁( see : ▁ ▁Ren an ). ▁It ▁flows ▁down ▁the ▁whole ▁length ▁of ▁the ▁valley ▁of ▁Saint - Im ier , ▁( Er g uel ), ▁leaving ▁it ▁through ▁the ▁g orge ▁of ▁Ta uben lo ch , ▁it ▁flows ▁across ▁the ▁city ▁of ▁B iel / B ienne ▁into ▁the ▁Lake ▁of ▁B ienne , ▁at ▁the ▁alt itude ▁of ▁ 4 2 9 ▁metres , ▁upon ▁a ▁stretch ▁of ▁ 4 5 ▁kilometres . ▁It ▁leaves ▁it ▁through ▁the ▁last ▁leg ▁of ▁the ▁Th ielle ▁river , ▁ ▁mer ging ▁into ▁the ▁N id au - B ü ren ▁channel ▁( A are ▁river ), ▁just ▁before ▁the ▁reg ulating ▁dam ▁Port ▁. ▁ ▁Trib ut aries ▁Its ▁main ▁trib ut aries ▁are ▁la ▁Dou , ▁la ▁Ra iss ette , ▁le ▁Ter bez ▁and ▁l ' Or v ine . ▁ ▁History ▁ ▁On ▁December ▁ 2 1 , ▁ 1 9 9 1 , ▁the ▁river ▁has ▁prov oked ▁significant ▁flo oding ▁along ▁its ▁course : ▁i . e . ▁in ▁Son ce bo z , ▁its ▁level ▁had ▁raised ▁by ▁a ▁significant ▁ 1 . 1 0 ▁meter , ▁with ▁ 6 5 ▁cub ic ▁meters ▁of ▁water ▁per ▁second . ▁ ▁References ▁▁ ▁La ▁Su ze ▁( site ), ▁C anton ▁de ▁Ber ne , ▁consult ed ▁on ▁September ▁ 2 3 , ▁ 2 0 0 7 ▁ ▁See ▁also ▁J ura ▁water ▁correction ▁ ▁Category : R ivers ▁of ▁the ▁canton ▁of ▁Bern