Question: What geographic features are Gasherbrum I and Tirich Mir?
Context: Gasherbrum I (Urdu: ‎ ; ), surveyed as K5 and also known as Hidden Peak, is the 11th highest mountain in the world at 8080 m above sea level.  It is located on the Pakistani–Chinese border in Gilgit–Baltistan region of Pakistan and Xinjiang region of China.  Gasherbrum I is part of the Gasherbrum massif, located in the Karakoram region of the Himalaya.  Gasherbrum is often claimed to mean "Shining Wall", presumably a reference to the highly visible face of the neighboring peak Gasherbrum IV; but in fact it comes from "rgasha" (beautiful) + "brum" (mountain) in Balti, hence it actually means "beautiful mountain." The Buni Zom group is a prominent mountain area of Chitral, in the Hindu Raj range of Pakistan.  Buni Zom (main) is the highest peak of the group with an elevation of 6542 m .  It is located about 50 km (30 mi) northeast of the town of Chitral, and about 50 km (30 mi) east of Tirich Mir (7,708 m), the highest peak in the Hindu Kush. Tirich Mir (Khowar/Urdu: ‎ ) (alternatively Terich Mir, Terichmir and Turch Mir) is the highest mountain of the Hindu Kush range, and the highest mountain in the world outside of the Himalayas-Karakoram range, located in Chitral District of Pakistan.  The mountain was first climbed in 1950 by a Norwegian expedition consisting of Arne Næss, P. Kvernberg, H. Berg, and Tony Streather.  Tirich Mir overlooks Chitral town, and can be easily seen from the main bazaar. Istor-o-Nal or इस्तोर-ओ-नल is the third highest mountain in the Hindu Kush, in the Chitral District of the North-West Frontier Province of Pakistan.  It is the 68th highest independent peak in the world.  It crowns a massif with eleven peaks of elevation more than 7000 m .  The peak is located a few kilometres northeast of Tirich Mir (the highest mountain in the Hindu Kush), across the Tirich Glacier.  Because Istor-o-Nal is behind the higher peak of Tirich Mir from many viewpoints, it is not easily visible and therefore not well known. The Khoshey (Khowar: "Khow", Chitrali: "Khosh Yemeni") are a Kho tribe residing in the Torkhow, Mulkhow,  Laspur, Chitral, Drosh, Tirich Mir, Ayon, Chitral District of Khyber-Pakhtunkhwa province of Pakistan and Badakhshan.  The Khoshey speak the Khowar language. Håhellerskarvet, meaning "shark cave mountain" in Norwegian, is a 2,910 m high partially ice-covered mountain between Austreskorve Glacier and Lunde Glacier in the Mühlig-Hofmann Mountains of Queen Maud Land, East Antarctica.  Other nearby geographic features include Håhelleren Cove, indenting the north side of Håhellerskarvet, Håhelleregga Ridge, an irregular rock ridge just north of Håhellerskarvet, Håhellerbotnen Cirque, a large cirque on the east side of Håhelleregga Ridge, and Jøkulkyrkja, a broad, ice-topped mountain located east of Lunde Glacier.  All of these geographic features were plotted from surveys and air photos by the Sixth Norwegian Antarctic Expedition (1956–60). Noshaq (also called Nowshak or Nōshākh; Urdu/Persian/Pashto: نوشاخ‎ ) is the highest peak in Afghanistan and the second highest peak in the Hindu Kush Range (after Tirich Mir) at 7492 m .  It lies on the border between Badakhshan Province in Afghanistan and Chitral District, Khyber Pakhtunkhwa, Pakistan, and is the world's westernmost 7,000 meter massif. Lieutenant Colonel (Retired) Harry Reginald Anthony "Tony" Streather OBE (born 24 March 1926) is a former British army officer who served in the Gloucestershire Regiment, and mountaineer who first-ascended Tirich Mir and Kangchenjunga. Ralph Høibakk (born 14 July 1937) is a Norwegian entrepreneur.  He established the Tandberg Data company in 1978, which produced ergonomically designed laptops and keyboards.  Høibakk left the company in 1986, and started Høibakk Invest, which provides management consulting for new enterprises.  He is also a mountaineer, and has climbed the Tirich Mir, Mount Everest and Drangnag Ri mountains in Asia with Norwegian philosopher Arne Næss and Arne Næss, Jr. Avalanche control or avalanche defense activities reduce the hazard avalanches pose to human life, activity, and property.  Avalanche control begins with a risk assessment conducted by surveying for potential avalanche terrain by identifying geographic features such as vegetation patterns, drainages, and seasonal snow distribution that are indicative of avalanches.  From the identified avalanche risks, the hazard is assessed by identifying threatened human geographic features such as roads, ski hills, and buildings.  Avalanche control programs address the avalanche hazard by formulating prevention and mitigation plans, which are then executed during the winter season.  The prevention and mitigation plans combine extensive snow pack observation with three major groups of interventions: active, passive, and social - sometimes more narrowly defined as "explosive", "structural", and "awareness" according to the most prevalent technique used in each.  Avalanche control techniques either directly intervene in the evolution of the snow pack, or lessen the effect of an avalanche once it has occurred.  For the event of human involvement, avalanche control organizations develop and train exhaustive response and recovery plans.
Answer: mountain