Longest river in India - Ganges
Longest Canal - Indira Gandhi Canal
Highest mountain peak = Godwin Austin (k2)
Highest Dam = Tehri Dam, Uttarakhand
Highest Waterfall = Kunchikal waterfall, Karnataka
Highest Gateway = Buland Darwaza, Fatehpur Sikri, Uttar Pradesh
Highest Award = Bharat Ratna
Highest Gallantry Award = Paramveer Chakra
Highest Battle field = Siachin Glacier
Highest rainfall Place = Mawsynram, Meghalaya
Highest Airport = Leh, Laddakh
Highest Lake = Cholamu Lake, Sikkim
Highest Tower = Qutub Minar, Delhi
Highest populated State = Uttar Pradesh
Highest Radio Station = The Leh station of AIR
Highest Statue = Sardar Vallabhbhai Patel, Gujarat
Largest lake of Fresh water = Wular lake, Kashmir
Largest Temple = Sri Ranganathaswamy Temple, Tamil Nadu
Largest Mosque = Jama Masjid, Delhi
Largest Church = Se Cathedral, Goa
Largest Gurudwara = Golden Temple, Amritsar
Largest Monastery = Tawang Monastery, Arunachal Pradesh
Largest populated city = Mumbai, Maharastra
Largest Building = Rashtrapati Bhawan, Delhi
Largest Museum = National Museum, Kolkata
Largest Auditorium = Sri Shanmukhananda Hall, Mumbai
Largest Cinema Theatre = Thangam, Madurai
Largest Barrage = Farakka Barrage, Ganga
Largest Delta = Sunderban Delta, West Bengal
Largest Dome = Gol Gumbaz, Bijapur, Karnataka
Largest Zoo = Zoological Gardens, Alipur, Kolkata
Largest Exhibition Ground = Pragati Maidan Complex, New Delhi
Largest Desert = Thar, Rajasthan
Largest cave temple = Kailash temple, Ellora, Maharashtra
Largest Cave = Amarnath Cave, Jammu and Kashmir
Largest Hotel = Oberoi –Sheraton, Mumbai
Largest State by Area = Rajasthan
Largest State by Population = Uttar PradeshLargest Hospital = B. J Medical College and Civil Hospital, Ahmedabad
Largest corridor = Rameshwaram temple corridor, Tamil Nadu
Largest Post Office = Mumbai GPO
Largest forest area state = Madhya Pradesh
Largest Prison = Tihar Central Jail, Delhi
Largest Stadium = Salt lake Stadium, Kolkata
Largest Port = Mumbai
Largest Lake of Saline water = Chika lake, Orissa
Largest river island = Majuli, Brahmaputra river, Assam
Largest Planetarium = Birla Planetarium, Kolkata
Largest man-made lake = Govind Sagar, Bhakra Dam
Largest Cantilever Span Bridge = Howrah Bridge, Kolkata
Largest library = National Library, Kolkata
Largest Lok Sabha Contituency by area = Ladhak
Largest Lok Sabha Contituency by population = Outer Delhi
biggest River = Ganga
biggest tributary river of India = Yamuna river
biggest coastline State = Gujarat
biggest tunnel = Pir Panjal Railway Tunnel, Jammu & Kashmir
biggest national highway = NH-7 which runs from Varanasi to Kanyakumari
biggest Dam = Hirakud Dam, Orissa
biggest River Bridge = Dhola-Sadiya Bridge, Assam
biggest Electric railway line = From Delhi to Kolkata via Patna
biggest Railway Platform = Gorakhpur, Uttar Pradesh
biggest river which forms estuary = Narmada
biggest bridge above water = Bandra-Worli Sea Link, Maharastra
biggest distance run train = Vivek Express
biggest nonstop run train = Trivandrum Rajdhani
biggest railway bridge = Vembanad Rail bridge, Kerala
biggest rail-road bridge = Bogibeel bridge, Assam
biggest Beach = Marina Beach, Chennai
biggest River ropeway = Brahmaputra River, Guwahati
Smallest State by Area = Goa
Smallest State by Population = Sikkim
Smallest Lok Sabha Constituency by area = Chandni Chowk
Smallest Lok Sabha Constituency by population = Lakshadweep
Tallest building = Imperial Tower, Mumbai