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Longest River in India: The Ganges
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Longest Tributary river of India: Yamuna
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Largest Lake: Wular Lake, Kashmir
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Largest Lake (Saline Water): Chilka Lake, Orrisa
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Largest Man-Made Lake: Govind Vallabh Pant Sagar (Rihand Dam)
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Largest Fresh Water Lake: Kolleru Lake (Andhra Pradesh)
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Largest Populated City: Mumbai
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Largest State(Area): Rajasthan
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Largest State(Population): Uttar Pradesh
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State wise largest area under forest: Madhya Pradesh
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Largest Delta: Sunderbans Delta
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Largest River without Delta: Narmada and Tapti
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Longest Cantilever Span bridge: Howrah Bridge
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Longest River Bridge: Mahatma Gandhi Setu, Patna
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Biggest Cave temple: Ellora
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Longest Road: Grand Trunk Road
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Largest Public Sector Bank: State Bank of India
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Longest Canal: Indira Gandhi Canal or Rajasthan Canal (Rajasthan)
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Largest Dome: Gol Gumbaz at Bijapur
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Largest Zoo: Zoological Garden at Alipur (Kolkata)
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Largest Museum: India Museum at Kolkata
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Longest Dam: Hirakud Dam (Orrisa)
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Largest District: Kutch district
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State with the longest coastline: Gujarat
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State with the longest coastline of South India: Andhra Pradesh
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Longest Electric Railway Line: From Delhi to Kolkata via Patna
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Longest Railway Route: From Assam to Kanyakumari
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Longest Railway Platform: Kharagpur (W. Bengal)
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Longest Railway Station: Ghum (W. Bengal)
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Longest Platform: Kharagpur (West Bengal) 833 meters in Length. It is also the longest railway station in world
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Longest Tunnel: Jawahar tunnel (Jammu & Kashmir)
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Longest Highway: NH-44 (NH-7) which turns from Varanasi to Kanyakumari
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Largest State (Area): Rajasthan
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Largest State (Population): Uttar Pradesh
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Largest Cave: Amarnath (J&K)
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Largest Cave Temple: Kailash Temple, Ellora (Maharastra)
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Largest Animal Fair: Sonepur (Bihar)
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Largest Auditorium: Sri Shanmukhanand Hall (Mumbai)
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Largest Port: Mumbai
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Largest Gurudwara: Golden Temple, Amritsar
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Largest Church: Saint Cathedral (Goa)
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Longest River: Ganga (2640 km long)
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Longest Beach: Marina Beach, Chennai
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Largest River Island: Majuli (Brahmaputra River, Asom)
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Largest Planetarium: Birla Planetarium (Kolkata)
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Largest inland salt lake: Sambhar lake