The Tre Cime di Lavaredo, also called the Drei Zinnen in the Sexten Dolomites of northeastern Italy. The north walls of the mountains belong to the municipality of Dobbiaco the rear ones to that of Belluno. They are probably one of the best-known mountain groups in the Alps.
The three peaks, from east to west, are:
Cima Piccola / Kleine Zinne („little peak“)
Cima Grande / Große Zinne („big peak“)
Cima Ovest / Westliche Zinne („western peak“).
The peaks are composed of well-layered dolomites of the Dolomia Principale (Hauptdolomit) formation, Carnian to Rhaetian in age, as are many other groups in the Dolomites (e.g., the Tofane, the Pelmo or the Cinque Torri).
Until 1919 the peaks formed part of the border between Italy and Austria-Hungary. Now they lie on the border between the Italian provinces of South Tyrol and Belluno and still are a part of the linguistic boundary between German-speaking and Italian-speaking majorities. The Cima Grande has an elevation of 2,999 metres (9,839 ft). It stands between the Cima Piccola, at 2,857 metres (9,373 ft), and the Cima Ovest, at 2,973 metres (9,754 ft).
The Three Peaks rise on the southern edge of the extensive pinnacle plateau with the Langen Alm (La Grava Longa), an alpine plateau at around 2200 m to 2400 m, which here forms the end of the Rienz Valley (Valle della Rienza). There are three small mountain lakes, the Zinnenseen. This area north of the mountains to the peaks to the municipality of part Toblach in South Tyrol and the Natural Park Three Peaks (up to 2010 Sesto Dolomites Nature Park), the since 2009 is part of the UNESCO World Heritage.
The ridge of the battlements, which runs in a west-east direction, forms the border with the municipality of Auronzo di Cadore in the province of Belluno, which also represents the German-Italian language border. To the northeast, this ridge continues to the 2454 m high Paternsattel (Forcella Lavaredo), where it turns north to the mountains Passportenkopf (Croda di Passaporto, 2719 m) and Paternkofel (Monte Paterno, 2744 m). In the west it sits across the Forcella Col di Mezzo (2315 m) transition to the Zinnenkuppe (Col di Mezzo, 2254 m) and on to the 2252 m high Katzenleiterkopf (Croda d’Arghena).
To the southwest of the Drei Zinnen, the Forcella Col di Mezzo is followed by the Plano di Longeres plateau above the Valle di Rinbianco, a side valley of the Rienz Valley. Immediately south of the western pinnacle, the Forcella di Longeres saddle (2235 m) separates the Plano di Longeres from the Vallone di Lavaredo, a side valley of the Piave valley. To the south lies the Cadini group.
Cortina d’Ampezzo, 17 kilometers southwest, is the largest city in the area. Other larger towns are Toblach 13 kilometers northwest and Innichen 12 kilometers north.
The Sexten Dolomites are surrounded by other mountain ranges on all sides, and this sheltered location in the interior of the Alps provides relatively favorable climatic conditions considering the altitude. Nevertheless, when cold fronts pass the area, rapid weather changes with fog, wind and heavy rainfall can occur, even as snow, even in high summer. In shady gorges and under north walls, the snow can lie until late summer, sometimes all year round, even though there are no glaciers here.
The alpine vegetation zone around Drei Zinnen is dominated by the raibl layer’s alpine mats. The plateau around Lange Alm is one of the few areas with grazing land in the nature park. Alpines are strikingly flowery; examples of plants that thrive here are beard bell, edelweiss and Gentiana clusii. The alpine marmot is a numerous mammal; there are also hares and chamois. On the other hand, there are no ibex in the Sexten Dolomites. Of birds there are Rock ptarmigan, ravens and golden eagles, and also hubriscan often be found hunting at this altitude.Vipers, especially the black variety, can be found at the unusual (for reptiles) altitude of 2600 m.
The vegetation on the vast clocks and on the southern flanks of the peaks is characterized by plants that are able to adapt to the constant movements of the stone clock. Examples of these are alpine cod mouth (Linaria alpina), French edible acid (Rumex scutatus), Thlaspi cepaeifolium, Potentilla nitida and alpine poppy (Papaver alpinum). In crevices are trickled Saxifraga squarrosa, cruciferous Kernera saxatilis, carnation Minuartia sedoides and the rare Paederota bonarota. In the steep, shady north walls there is hardly anyvascular plants; the most conspicuous vegetation is next to moss and low large carpets with blue-green bacteria, which appear especially on moist rock walls in the form of characteristic «ink lines».A mammal that moves all the way into the cliff areas is the snow field mouse (Chionomys nivalis). Insects (Tichodroma muraria) and alpine quays (Pyrrhocorax graculus) hunt insects here.
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