Nepal contains 125 languages from four distinct language families — Indo-Aryan, Tibeto-Burman, Austro-Asiatic, and Dravidian. The Indo-Aryan speakers dominate the political structure. Brahmin and Chhetri castes together form approximately 29% of the population, speak Nepali as a first language, and have controlled national institutions since unification under the Shah dynasty in 1768. Their villages scatter across the middle hills between 1,000 and 2,500 meters, where terraced rice and millet define the agricultural landscape. This group provided the administrative class under the Rana oligarchy and continues to hold disproportionate representation in government, military leadership, and judiciary positions.
The Newar civilization built the three city-states of the Kathmandu Valley — Kathmandu, Patan, and Bhaktapur. Newari belongs to the Tibeto-Burman family but absorbed substantial Sanskrit vocabulary through centuries of Hindu-Buddhist synthesis. Newars historically controlled trans-Himalayan trade routes and developed sophisticated metalwork, woodcarving, and architectural traditions visible in pagoda temple forms that Araniko exported to China's Yuan court in 1260. The Malla kings ruled Newar kingdoms until Prithvi Narayan Shah's conquest in 1768-69. Newari remains the primary language of the old city cores, though urban expansion and internal migration have reduced its domains. Newar Buddhism maintains unique Vajrayana practices distinct from Tibetan lineages, including hereditary priest castes called Bajracharya and Shakya.
The Janajati classification contains 59 officially recognized indigenous groups, predominantly Tibeto-Burman speakers with pre-Hindu religious frameworks. Magars occupy the western middle hills from Palpa to Rolpa districts, historically serving as soldiers — the British Indian Army recruited heavily from Magar villages for Gurkha regiments starting in 1815. Gurungs cluster in Lamjung, Kaski, and Gorkha districts between 1,200 and 2,500 meters, practice Tibetan Buddhism mixed with Bon elements, and dominated early mountaineering as high-altitude porters and sirdars. Tamangs encircle the Kathmandu Valley in a geographic ring, speak a language closely related to Tibetan, and work as laborers in Kathmandu's construction economy. Rai and Limbu groups occupy eastern hill districts — Khotang, Bhojpur, Taplejung, Panchthar — and maintain shamanistic traditions called Mundhum. Sherpas migrated from Kham in eastern Tibet approximately 500 years ago, settling in Solukhumbu, Helambu, and Langtang valleys above 3,000 meters. Their Tibetan Buddhist practice and adaptation to altitude made them essential to Himalayan expeditions after Tenzing Norgay summited Everest with Edmund Hillary in 1953.
The Terai plains hold 51% of Nepal's population in 17% of its land area. Tharu groups occupied malarial lowlands before DDT campaigns in the 1950s, developing genetic adaptations to endemic malaria. Maithili speakers in the eastern Terai maintain stronger cultural ties to Bihar than to Kathmandu. The caste system operates as legal fact and social reality — intercaste marriage restrictions persist in rural areas, and dalit access to Hindu temples remains contested. The 2015 constitution reserved 33% of parliamentary seats for women, proportional representation for Madhesis and Janajatis, and one dalit seat per district, converting demographic reality into political structure after Maoist insurgency demands from 1996-2006.