The Hinterrhein (

German German(s) may refer to: * Germany (of or related to) **Germania (historical use) * Germans, citizens of Germany, people of German ancestry, or native speakers of the German language ** For citizens of Germany, see also German nationality law **Ge ...

; Italian: ''Reno Posteriore'';

Sutsilvan Romansh (; sometimes also spelled Romansch and Rumantsch; Sursilvan: ; Vallader, Surmiran, and Rumantsch Grischun: ; Putèr: ; Sutsilvan: , , ; Jauer: ) is a Gallo-Romance language spoken predominantly in the Swiss canton of the Gr ...

: ''Ragn Posteriur'';

Sursilvan Sursilvan (; also ''romontsch sursilvan'' ; Sursilvan, Vallader, Surmiran, Sutsilvan, and Rumantsch Grischun: ''sursilvan''; Puter: ''sursilvaun'') is a group of dialects of the Romansh language spoken in the Swiss district of Surselva. It is ...

: ''Rein Posteriur''; Rumantsch Grischun, Vallader, and Puter: ''Rain Posteriur''; Surmiran: ''Ragn posteriour''; en, Posterior Rhine) is one of the two initial

tributaries A tributary, or affluent, is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main stem river drain the surrounding drain ...

of the

Rhine ), Surselva, Graubünden, Switzerland , source1_coordinates= , source1_elevation = , source2 = Rein Posteriur/Hinterrhein , source2_location = Paradies Glacier, Graubünden, Switzerland , source2_coordinates= , source ...

(shorter in length but bigger by volume) rising in the

canton Canton may refer to: Administrative division terminology * Canton (administrative division), territorial/administrative division in some countries, notably Switzerland * Township (Canada), known as ''canton'' in Canadian French Arts and ente ...

of Graubünden in

Switzerland ). Swiss law does not designate a ''capital'' as such, but the federal parliament and government are installed in Bern, while other federal institutions, such as the federal courts, are in other cities (Bellinzona, Lausanne, Luzern, Neuchâtel ...

Course

Flowing from the village Hinterrhein near the San Bernardino Pass through the Rheinwald valley, the river flows into a gorge called Roflaschlucht. In this gorge an equally sized tributary, the

Avers Rhine , image = Averser Rhein im Ferreratal 1827.jpg , image_size = , image_caption = The Avers Rhine in Val Ferrera valley, lithograph from 1827 , subdivision_type2 = Canton , subdivision_name2 = Graubünden, Swi ...

, adds waters from the deep Val Ferrera and the very remote alp Avers and its side valley

Valle di Lei Lago di Lei is a reservoir in the Valle di Lei, powering the Hinterrhein storage power stations. The reservoir is almost entirely in Italy, but the barrage was built on territory ceded by Italy to Switzerland (municipality of Ferrera, Grisons) ...

on Italian territory. After the Rofla Gorge, the valley widens into a section called Schams. The Hinterrhein then reaches Andeer, before passing through another gorge, Viamala just before Thusis. Now another tributary of slightly bigger volume reaches the Hinterrhein as the Landwasser, draining a system of valleys, which is commonly known as

Davos , neighboring_municipalities= Arosa, Bergün/Bravuogn, Klosters-Serneus, Langwies, S-chanf, Susch , twintowns = } Davos (, ; or ; rm, ; archaic it, Tavate) is an Alps, Alpine resort town and a Municipalities of Switzerland, muni ...

joins via the Albula coming from the

Albula Pass The Albula Pass ( Romansh: ''Pass d'Alvra'' or , german: Albulapass) (el. 2312 m) is a Swiss mountain pass in the canton of Graubünden. It lies at the heart of the Albula Alps, on the watershed between the Albula, tributary of the Rhine and t ...

, which is also the name of a railway line that has become a UNESCO world heritage. Another big tributary of Albula river is Gelgia from the Julier pass area. After flowing to Rothenbrunnen through a valley called Domleschg (a valley with an incredible number of castles, showing the importance of transit in the area) the river is again left alone from civilisation in the

floodplain A floodplain or flood plain or bottomlands is an area of land adjacent to a river which stretches from the banks of its channel to the base of the enclosing valley walls, and which experiences flooding during periods of high discharge.Goudi ...

''Isla Bella'' near

Rhäzüns Rhäzüns is a municipality in the Imboden Region in the Swiss canton of Grisons. History Rhäzüns is first mentioned about 840 as ''Raezunne''. It formed a single parish with Bonaduz until the Reformation. It was part of the Grey League f ...

, before it joins the Anterior Rhine at Reichenau.

Significance

To learn about the importance of travel along the Hinterrhein, a multiday trekking route is signposted along the river from Thusis to Splügen, where it turns south to Splügen Pass, a historically important transit route to Italy. Nowadays there is no traffic across the Splügen pass in winter, whereas the route across its age-old rival, the San Bernardino Pass, was given a long road tunnel in 1967 that made it possible to keep the road open all year.Road closures on passes in Graubünden
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References

Rivers of Switzerland Rivers of Graubünden Andeer Rheinwald Schams Sufers Zillis-Reischen Rongellen Sils im Domleschg Thusis Fürstenau, Switzerland Cazis Domleschg Rothenbrunnen Rhäzüns Domat/Ems Bonaduz {{Switzerland-river-stub