Mountain passes are high-altitude crossings through mountain ranges that serve as strategic corridors for trade, defence, and pilgrimages. Most Himalayan passes are closed from October to April due to snowfall. UPSC frequently tests which pass connects which regions, the mountain range it belongs to, and its strategic significance. BRO (Border Roads Organisation) has been transforming several passes into all-weather corridors through tunnel construction — a major recent-affairs topic.

Himalayan and Other Passes

PassMountain RangeState/UTConnectsAltitudeStrategic/Trade Importance
Mig LaLadakh RangeLadakhHanle to Fukche (near LAC)5,913 m (19,400 ft)World's highest motorable road (as of Oct 2025); BRO Project Himank; Likaru-Mig La-Fukche route; near Line of Actual Control
Umling LaLadakh RangeLadakhChisumle to Demchok (near LAC)5,799 m (19,024 ft)BRO Project Himank; opened 2017; held Guinness World Record as world's highest motorable road until Oct 2025 when Mig La surpassed it; near India-China border
Khardung LaLadakh RangeLadakhLeh to Nubra Valley (Siachen supply route)5,359 m (17,582 ft)BRO maintained; key Siachen Glacier supply line; historically (and incorrectly) called world's highest motorable pass — that record now belongs to Mig La
Chang LaLadakh RangeLadakhLeh to Pangong Tso5,360 mRoute to Pangong Lake; used by defence forces
Tanglang LaLadakh RangeLadakhUpshi to Pang (Leh-Manali Highway)5,328 mOn NH-3 (Leh-Manali Highway)
Bara Lacha LaZanskar RangeHP/Ladakh borderLahaul (HP) to Ladakh4,890 mOn Leh-Manali Highway; source of Bhaga and Yunam rivers
Shinkhun La (Shinkun La)Zanskar RangeHP-Ladakh (Nimu-Padam-Darcha Road)Himachal Pradesh to Ladakh (Zanskar)4,820 m (15,800 ft)Under-construction tunnel (4.1 km twin-tube, ₹1,681 cr); first blast by PM Modi Jul 2024; will be world's highest tunnel when complete (~2028); third all-weather highway to Ladakh
Zoji LaGreat HimalayaJ&K / Ladakh borderSrinagar (Kashmir Valley) to Drass-Kargil3,528 m (11,575 ft)Only road between Kashmir and Ladakh; Zoji La Tunnel (14.2 km, under construction, revised completion 2028) will provide all-weather connectivity; strategic 1947 war importance
Banihal PassPir Panjal RangeJ&KJammu to Srinagar (Kashmir Valley)2,832 mJawahar Tunnel beneath it; Banihal-Qazigund rail tunnel
Pir Panjal PassPir Panjal RangeJ&KPir Panjal Range crossing~3,490 mHistoric; gave name to Pir Panjal Range
Rohtang PassPir Panjal RangeHPManali to Lahaul-Spiti3,978 mNH-3; Atal Tunnel (Rohtang) opened Oct 2020 — 8.8 km all-weather tunnel beneath it
Shipki LaGreat HimalayaHP (Kinnaur)Spiti Valley/HP to Tibet~3,933 mSutlej enters India here from Tibet; India-China trade route — included in India-China Aug 2025 agreement (alongside Lipulekh and Nathu La) to reopen border trade
Nathu LaHimalayasSikkimGangtok/Sikkim to Tibet (Chumbi Valley)4,310 m (14,140 ft)Silk Road route; closed 1962-2006; reopened for limited trade 2006; included in India-China Aug 2025 border trade agreement
Jelep LaHimalayasSikkimSikkim to Chumbi Valley, Tibet4,267 mHistoric British India-Tibet trade route; closed post-1962
LipulekhGreat HimalayaUttarakhand (Pithoragarh)Uttarakhand to Tibet; Kailash-Mansarovar yatra route5,334 mIndia-Nepal border dispute (Kalapani-Lipulekh-Limpiyadhura); India built link road 2020; India-China agreed Aug 2025 to reopen border trade through Lipulekh — Nepal protested strongly; trade resumption began Mar 2026
Niti PassGreat HimalayaUttarakhand (Chamoli)Uttarakhand to Tibet5,068 mAncient trade route; Dhauliganga flows nearby
Mana PassGreat HimalayaUttarakhand (Chamoli)Badrinath region to Tibet5,610 mNear Badrinath; Saraswati river source area
Sela PassHimalayasArunachal Pradesh (West Kameng / Tawang)Tezpur (Assam) to Tawang4,170 m (13,700 ft)Strategic: only road to Tawang; Sela Tunnel inaugurated Mar 9, 2024 by PM Modi — Tunnel 1 (980 m single-tube) + Tunnel 2 (1,555 m twin-tube); world's longest bi-lane tunnel above 13,000 ft; cost ₹825 cr; built by BRO
BumlaHimalayasArunachal Pradesh (Tawang)Tawang to Tibet/China4,407 mIndia-China border (McMahon Line); meeting point for Indian and Chinese troops on festive occasions
Dihang PassHimalayasArunachal PradeshAP to TibetHigh altitudeEastern extremity of Himalayan crossing; near Brahmaputra gorge
Diphu PassPatkai RangeArunachal Pradesh (Changlang)AP to Myanmar1,657 mIndia-Myanmar border; strategically important; near tri-junction with China
Pangsau PassPatkai RangeArunachal PradeshStilwell Road (Ledo Road) corridor1,000 mIndia-Myanmar border; part of historic Stilwell/Ledo Road (WWII-era)
Thaga LaHimalayasSikkim / AP regionContested ridge in Kameng sector~4,600 m1962 war flashpoint ("Thagla Ridge incident")
Palakkad GapWestern GhatsKerala/Tamil NaduKerala to Tamil Nadu460 mNatural break in Western Ghats; rail and road corridor; lowest pass in the Ghats
Bhor GhatWestern GhatsMaharashtraMumbai to Pune (Deccan)~625 mRail (Central Railway) and road; Mumbai-Pune Expressway region
Thal GhatWestern GhatsMaharashtraMumbai to Nashik—NH-3 corridor; steep gradient railway

BRO Tunnel Projects — Key Facts for UPSC

TunnelPass / RouteState/UTLengthStatusSignificance
Atal Tunnel (Rohtang)Rohtang PassHP8.8 kmOpen (Oct 2020)World's longest highway tunnel above 10,000 ft at time of opening; all-weather Manali-Lahaul connectivity
Sela TunnelSela PassArunachal PradeshT1: 980 m + T2: 1,555 m (twin-tube)Open (Mar 9, 2024)World's longest bi-lane tunnel above 13,000 ft; all-weather Tezpur-Tawang; ₹825 cr; BRO
Zoji La TunnelZoji LaJ&K / Ladakh14.2 kmUnder construction (target 2028)Will be Asia's longest tunnel; all-weather Srinagar-Ladakh
Shinkhun La TunnelShinkhun LaHP-Ladakh4.1 km (twin-tube)Under construction (target ~2028)Will be world's highest tunnel at 15,800 ft; third highway to Ladakh

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