Editing Rhine (section)

====Anterior Rhine and Posterior Rhine====
{{main|Vorderrhein|Hinterrhein (river)}}
[[File:Rheinzusammenfluss.JPG|thumb|The confluence of the Anterior Rhine to the lower left and the Posterior Rhine in the background forms the [[Alpine Rhine]] (to the left) next to [[Reichenau, Switzerland|Reichenau]].]]
The source of the river is generally considered north of ''[[Tomasee|Lai da Tuma/Tomasee]]'' on ''Rein Anteriur/Vorderrhein'',<ref>{{Cite web |url=http://www.atlasderschweiz.ch/atlas/en/trial_version/ |archive-url=https://web.archive.org/web/20110609183630/http://www.atlasderschweiz.ch/atlas/en/trial_version/ |title=Atlas der Schweiz Switzerland maps by Swiss Federal Office of Topography |archive-date=9 June 2011}}</ref> although its southern tributary ''[[Rein da Medel]]'' is actually longer before its confluence with the Anterior Rhine near [[Disentis]].

:The '''Anterior Rhine''' ({{langx|rm|Rein Anteriur}}, {{langx|de|Vorderrhein}}) springs from ''Lai da Tuma/Tomasee'', near the [[Oberalp Pass]] and passes the impressive ''[[Ruinaulta]]'' formed by the largest visible rock slide in the alps, the [[Flims Rockslide]].

:The '''Posterior Rhine''' ({{langx|rm|Rein Posteriur}}, {{langx|de|Hinterrhein}}) starts from the [[Paradies Glacier]], near the ''Rheinwaldhorn''. One of its tributaries, the ''Reno di Lei'', drains the ''[[Lago di Lei|Valle di Lei]]'' on politically Italian territory. After three main valleys separated by the two gorges, ''[[Roflaschlucht]]'' and ''[[Viamala]]'', it reaches [[Reichenau, Switzerland|Reichenau]] in [[Tamins]].
[[File:Karte Alpenrhein.png|thumb|upright=1.15|Map of the Alpine Rhine]]

The Anterior Rhine arises from numerous source streams in the upper [[Surselva]] and flows in an easterly direction. One source is ''[[Lake Toma|Lai da Tuma]]'' ({{convert|2345|m|abbr=on}})<ref>{{cite map |url=https://s.geo.admin.ch/790e465925 |title=Lai da Tuma |map=1232 - Oberalppass |map-url=https://shop.swisstopo.admin.ch/en/products/maps/national/lk25?layer=ch.swisstopo.landeskarte25_papier.metadata&product=1232&productIdentifier=1232&childGroupIdentifier=lk25eb#product-1232 |scale=1:25 000 |series=National Map 1:25'000 |edition=2015 |date=2013 |publisher=Federal Office of Topography – [[swisstopo]] |location=Wabern, Switzerland |isbn=978-3-302-01232-2 |via=map.geo.admin.ch |access-date=1 March 2018}}</ref> with the ''[[Rein da Tuma]]'', which is usually indicated as source of the Rhine, flowing through it.

Into it flow tributaries from the south, some longer, some equal in length, such as the ''Rein da Medel'', the ''[[Rein da Maighels]]'', and the ''[[Rein da Curnera]]''. The Cadlimo Valley in the [[canton of Ticino]] is drained by the ''Reno di Medel'', which crosses the [[geomorphology|geomorphologic]] Alpine main ridge from the south.{{notetag|The geomorphological ridge line does not necessarily coincide with the [[Drainage divide|watershed]], since it refers to the average altitude in a surrounding circle}} All streams in the source area are partially, sometimes completely, captured and sent to storage reservoirs for the local hydro-electric power plants.

The culminating point of the Anterior Rhine's drainage basin is the [[Piz Russein]] of the Tödi massif of the [[Glarus Alps]] at {{convert|3613|m|sp=us}} above sea level. It starts with the creek ''Aua da Russein'' (lit.: "Water of the Russein").<ref>{{cite map |url=http://s.geo.admin.ch/9324aa0f5 |title=Piz Russein |map=1193 - Tödi |map-url=https://shop.swisstopo.admin.ch/en/products/maps/national/lk25?layer=ch.swisstopo.landeskarte25_papier.metadata&product=1193&productIdentifier=1193&childGroupIdentifier=lk25eb#product-1193 |scale=1:25 000 |series=National Map 1:25'000 |edition=2016 |date=2013 |publisher=Federal Office of Topography – [[swisstopo]] |location=Wabern, Switzerland |isbn=978-3-302-01193-6 |via=map.geo.admin.ch |access-date=28 February 2018}}</ref>

In its lower course, the Anterior Rhine flows through a gorge named ''[[Ruinaulta]]'' (Flims Rockslide). The whole stretch of the Anterior Rhine to the Alpine Rhine confluence next to Reichenau in Tamins is accompanied by a long-distance hiking trail called ''Senda Sursilvana''.<ref>{{Cite news|url=https://maps.graubuenden.ch/de/tour/weitwanderweg/85-senda-sursilvana-5-etappen-/13223088/|title=85 Senda Sursilvana (5 Etappen)|website=maps.graubuenden.ch|access-date=14 November 2019|archive-date=6 January 2020|archive-url=https://web.archive.org/web/20200106225753/https://maps.graubuenden.ch/de/tour/weitwanderweg/85-senda-sursilvana-5-etappen-/13223088/|url-status=dead}}</ref>

The Posterior Rhine flows first east-northeast, then north. It flows through the three valleys named [[Rheinwald]], [[Schams]] and [[Domleschg valley|Domleschg]]-[[Heinzenberg GR|Heinzenberg]]. The valleys are separated by the [[Rofla Gorge]] and [[Viamala]] Gorge. Its sources are located in the [[Adula Alps]] ([[Rheinwaldhorn]], [[Rheinquellhorn]], and [[Güferhorn]]).

The [[Avers Rhine]] joins from the south. One of its headwaters, the ''Reno di Lei'' (stowed in the [[Lago di Lei]]), is partially located in Italy.

Near [[Sils im Domleschg|Sils]] the Posterior Rhine is joined by the [[Albula (river)|Albula]], from the east, from the [[Albula Pass]] region. The Albula draws its water mainly from the [[Landwasser]] with the [[Dischmabach]] as the largest source stream, but almost as much from the [[Gelgia (river)|Gelgia]], which comes down from the [[Julier Pass]].

Numerous larger and smaller tributary rivers bear the name of the ''Rhine'' or equivalent in various [[Romansch language|Romansh]] idioms, including ''Rein'' or ''Ragn'', including:
* Anterior Rhine area: ''Rein Anteriur/Vorderrhein'', ''[[Rein da Medel]]'', ''[[Rein da Tuma]]'', ''[[Rein da Curnera]]'', ''[[Rein da Maighels]]'', ''Rein da Cristallina'', ''Rein da Nalps'', ''Rein da Plattas'', ''Rein da Sumvitg'', ''Rein da Vigliuts'', ''[[Valser Rhine]]''
* Posterior Rhine basin: ''Rein Posteriur/Hinterrhein'', ''[[Lago di Lei|Reno di Lei]]'', ''Madrischer Rhein'', ''[[Avers Rhine]]'', ''Jufer Rhein''
* Albula-Landwasser area: In the [[Dischma]] valley, near Davos, far east of the Rhine, there's a place called ''Am Rin'' ("Upon Rhine"). A tributary of the Dischma is called ''Riner Tälli''. Nearby, on the other side of the [[Sertig]], is the ''Rinerhorn''.