Refuge Quintino Sella au Félik

Castor (Italian: Castore) is a mountain in the Pennine Alps on the border between Valais, Switzerland and the Aosta Valley in Italy. It is the higher of a pair of twin peaks (German: Zwillinge), the other being Pollux, named after the Gemini twins of Roman mythology. Castor's peak is at an elevation of 4,225 m (13,862 ft), and it lies between Breithorn and the Monte Rosa. It is separated from Pollux by a pass at 3,847 m (12,621 ft), named Passo di Verra in Italian and Zwillingsjoch in German. Ascents are usually made from the alpine hut Capanna Quintino Sella on the Italian side, by means of the Felikjoch and the long and narrow southeast ridge. From the Swiss side, ascents start from Klein Matterhorn and go by way of the Italian glacier Grand Glacier of Verra and the mountain's west flank. The first ascent was made on August 23, 1861.

Pollux (Italian: Polluce) is a mountain in the Pennine Alps on the border between Valais, Switzerland and the Aosta Valley in Italy. It is the lower of a pair of twin peaks (German: Zwillinge), the other being Castor, named after the Gemini twins of Roman mythology. Pollux' peak is at an elevation of 4,089 m (13,415 ft). It is separated from Castor by a pass at 3,846 m (12,618 ft), named Passo di Verra in Italian, Col de Verra in French and Zwillingsjoch in German. The first ascent was by Jules Jacot from Geneva with guides Josef-Marie Perren and Peter Taugwalder (father) on August 1 (the Swiss national day) 1864. Their route was via the Schwarztor, a pass first crossed by John Ball and Gabriel Zumtaugwald in 1845. The impressive north ridge was first climbed by Captain John Percy Farrar (a future President of the Alpine Club) and Wylie Lloyd with guide Josef Pollinger of St. Niklaus in the canton Valais on 18 August 1893. Ascents are usually made from the Refuge Ottorino Mezzalama (3,036 m), the Monte Rosa hut (2,795 m); if traversing the peaks via Pollux's north ridge, PD+, the Refuge Quintino Sella au Félik (3,585 m), and the Rossi-Volante bivouac hut (3,850 m). The first winter and ski ascent of Pollux was by Dr Alfred von Martin and Karl Planck on 7 March 1913.

Refuge Ottorino Mezzalama (original name Italian: Refugio Ottorino Mezzalama) is a refuge in the Alps in Aosta Valley, Italy.

The Roccia Nera (Italian for Black Rock, French: Roche noire, German: Schwarzfluh) is a peak of the Breithorn range in the Pennine Alps, on the boundary between the Aosta Valley (northern Italy) and canton of Valais (southern Switzerland). It is the easternmost summit of the Breithorn massif, located east of the Gendarm (or eastern Breithorn Twin). It overlooks the Schwarztor (English: Black Gate) pass on its east side.

The Western Lyskamm (German: Liskamm Westgipfel) is a subsidiary peak of the Lyskamm.

The Gendarm (German and French (gendarme) for police officer, Italian: Quota), but also known as eastern Breithorn Twin (German: östlicher Breithornzwilling) is a peak of the Pennine Alps, located on the border between Switzerland and Italy, between the canton of Valais and the region of Aosta Valley. It is part of the Breithorn range, located east of the Theodul Pass. It is located just east of its other twin, the western Breithorn Twin, and west of the Roccia Nera.

The Eastern Breithorn (German: Breithorn (Ostgipfel), Italian: Breithorn Orientale) but also referred as the western Breithorn Twin (German: westlicher Breithornzwilling), is a peak of the Pennine Alps, located on the border between Switzerland and Italy, between the canton of Valais and the region of Aosta Valley. It is part of the Breithorn range, located east of the Theodul Pass. It lies between the Central Breithorn and its other twin, the Gendarm (or eastern Breithorn Twin). On its north side it overlooks the Breithorn Glacier.

The Breithorn Twins (German: Breithornzwillinge) are twin peaks of the Breithorn range of the Pennine Alps, located on the border between Switzerland and Italy, between the canton of Valais and the region of Aosta Valley. It is located east of the Theodul Pass. The twin peaks are called Eastern Breithorn/western Breithorn Twin (4,139 m) and Gendarm/eastern Breithorn Twin (4,109 m). They are about 115 m (377 ft) apart.

Lyskamm (German: Liskamm, formerly Lyskamm, literally "crest of the Lys"), also known as Silberbast (literally "silver bast"), is a mountain (4,532 m (14,869 ft)) in the Pennine Alps lying on the border between Switzerland and Italy. It consists of a five-kilometre-long ridge with two distinct peaks. The mountain has gained a reputation for seriousness because of the many cornices lying on the ridge and the frequent avalanches, thus leading to its nickname the Menschenfresser ("people eater").

The Central Breithorn (German: Breithorn (Mittelgipfel), Italian: Breithorn Centrale) is a peak of the Breithorn range in the Pennine Alps, located on the border between Switzerland and Italy, between the canton of Valais and the region of Aosta Valley. It is located east of the main summit of the Breithorn and west of the western Breithorn Twin.

The Breithorn (German for literally "broad horn"; 13,661 ft. or 4,164 m) is a mountain range of the Pennine Alps with its highest peak of the same name (but also called Breithorn (Western Summit)), located on the border between Switzerland and Italy. It lies on the main chain of the Alps, approximately halfway between the Matterhorn and Monte Rosa and east of the Theodul Pass. Most of the massif is glaciated and includes several subsidiary peaks, all located east of the main summit: the Central Breithorn, the western Breithorn Twin (or Eastern Breithorn), the Gendarm (or eastern Breithorn Twin) and the Roccia Nera. The main summit is sometimes distinguished by the name Western Breithorn (German: Breithorn (Westgipfel), Italian: Breithorn Occidentale). The nearest settlements are Zermatt (Valais) and St-Jacques (Aosta Valley). The Breithorn is considered the most easily climbed 4,000 m Alpine peak. This is due to the Klein Matterhorn cable car which takes climbers to over 3,820 m (12,700 ft) from Zermatt for a starting point. The standard route (SSW flank) is from the Italian side of the mountain (the south side) and continues over a glacial plateau before climbing to the summit on a 35 degree snow slope. However, inexperienced mountaineers may run into severe difficulty if caution is not taken near cornices or in bad weather. For experienced climbers wanting more of a challenge, the half traverse of the Breithorn crest is another option. The Breithorn was first climbed in 1813 by Henry Maynard (climber), Joseph-Marie Couttet, Jean Gras, Jean-Baptiste Erin and Jean-Jacques Erin.