Hinterrhein (river)

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Hinterrhein Posterior Rhine
The Hinterrhein southwest of Splügen
Native name	Ragn Posteriur  (Sutsilvan) Rein Posteriur  (Sursilvan) Rain Posteriur  (Rumantsch Grischun) Hinterrhein (German)
Location
Country	Switzerland
Canton	Grisons
Physical characteristics
Source
• coordinates	46°29′55″N 9°3′45″E / 46.49861°N 9.06250°E / 46.49861; 9.06250 (Hinterrhein source)
• elevation	2,400 m (7,900 ft)
Mouth
• coordinates	46°49′24″N 9°24′28″E / 46.82333°N 9.40778°E / 46.82333; 9.40778 (Hinterrhein mouth)
• elevation	585 m (1,919 ft)
Length	64 km (40 mi)
Basin size	1,693 km2 (654 sq mi)
Discharge
• average	59.6 m3/s (2,100 cu ft/s)[1]
Basin features
Progression	Rhine→ North Sea
River system	Rhine
Tributaries
• right	Ragn da Ferrera, Albula/Alvra
Waterbodies	Sufner See

The Hinterrhein (German: [ˈhɪntɐˌʁaɪn] ^ⓘ; Sutsilvan: Ragn Posteriur; Sursilvan: Rein Posteriur; Rumantsch Grischun, Vallader, and Puter: Rain Posteriur; Surmiran: Ragn posteriour; Italian: Reno Posteriore), or Posterior Rhine, is the right of the two initial tributaries of the River Rhine (the other being the Vorderrhein). It is located in the canton of Grisons (Graubünden), Switzerland. One of its upper tributaries is Reno di Lei, which is the outflow of Lago di Lei located in Lombardy, Italy.

Although it is shorter in length, its volume is larger than that of the Vorderrhein at their confluence near Reichenau, after which the river is called the Alpine Rhine, which flows out into Lake Constance (Bodensee).