The Gorner Glacier (German: Gornergletscher) is a valley glacier found on the west side of the Monte Rosa massif close to Zermatt in the canton of Valais, Switzerland. It is about 12.4 km (7.7 mi) long (2014) and 1 to 1.5 km (0.62 to 0.93 mi) wide. The entire glacial area of the glacier related to Gorner Glacier is 57 km2 (22 sq mi) (1999), which makes it the second largest glacial system in the Alps after the Aletsch Glacier system; however it ranks only third in length behind the Aletsch and Fiescher Glacier, respectively. Numerous smaller glaciers connect with the Gorner Glacier.
Glacier Montanvert was the common name in the 18th century for a portion of the Alps glacier, now known as Mer de Glace, on the northern slopes of the Mont Blanc massif. Alternative spellings of Montanvert include Montainvert and Montvers. The Glacier Montanvert was a popular tourist destination of European travellers and is referenced in numerous travel writings and novels of the time.