Longest, Largest, Biggest, Smallest, Tallest and Highest

Longest river (India)	Ganges
Longest river (World)	Nile
The longest tributary river of India	Yamuna
The longest river of the south	Godavari
Highest mountain peak	Godwin Austin (k2)
Largest lake (Fresh water)	Wular lake (Kashmir)
Highest Dam	Bhakra Dam (Punjab)
Largest Mosque	Jama Masjid, Delhi
Longest Road	Grand Trunk Road
State with longest coastline	Gujarat
Largest railway route	From Jammu to Kanya Kumari
Longest tunnel	Jawahar tunnel (Jammu & Kashmir)
Longest national highway	NH-7which runs from Varanasi to Kanyakumari
Longest Dam	Hirakod Dam (Orissa)
Longest River Bride	Mahatma Gandhi Setu, Patna
Longest populated city	Mumbai (1.60 crore)
Largest Museum	National Museum, Kolkata
Largest Delta	Sunderban Delta, W. Bengal
Largest Dome	Gol Gumbaz, Bijapur (Karnataka)
Largest Zoo	Zoological Gardens, Alipur, Kolkata
Largest man-made Lake	Govind Vallabh Pant Sagar (Rihand Dam)
Largest Desert	Thar (Rajasthan)
Highest Tower	Pitampura Tower, Delhi
Smallest State (Area)	Goa
Smallest State (Population)	Sikkim
Highest Waterfall	Gersoppa waterfall (Karnataka)
Longest Electric railway line	From Delhi to Kolkata via Patna
Densest populated State	West Bengal
Largest cave temple	Kailash temple, Ellora (Maharashtra)
Largest animal Fair	Sonepur (Bihar)
Highest Gateway	Buland Darwaza, Fatehpur Sikri (Agra)
Biggest Hotel	Oberal –Sharaton (Mumbai)
Largest State (Area)	Rajasthan
Largest State (Population)	Uttar Pradesh
Place of heaviest rainfall	Mausinram (Meghalaya)
Largest corridor	Rameshwaram temple corridor (Tamil Nadu)
Largest cantilever span bride	Howrah Bridge (Kolkata)
Largest forest state	M.P.
Highest straight gravity Dam	Bhakra Dam
Longest Railway Platform	Kharagpur (W. Bengal)
Largest Stadium	Salt lake (Yuva Bhaeti), Kolkata
Largest Port	Mumbai
Highest Lake	Devatal (Garhwal)
Largest Lake (Saline water)	Chika lake, Orissa
Highest Award	Bharat Ratna
Highest Gallantry Award	Paramveer Chakra
Largest Gurudwara	Golden Temple, Amritsar
Deepest river valley	Bhagirathi & Alaknanda
State with longest coastline of South India	Andhra Pradesh
Longest river which forms estuary	Narmada
Largest Church	Saint Cathedral (Goa)
Longest Beach	Marina Beach, Chennai
Highest Battle field	Siachin Glacier
Highest    Airport	Len (Laddakh)
Largest river island	Majuli (Brahmaputra river, Assam)
Largest Planetarium	Birla Planetarium (Kolkata)