Longest of India

Longest River	Ganges (2525 Km)
Longest Tributary	Yamuna (1367 Km)
State with the longest coastline	Gujarat
Longest Dam	Hirakund Dam (25.79 Km)
Longest Beach	Marina Beach (12 Km)
Longest Highway	NH44 (4112 Km)
Longest Railway Platform	Hubli Junction (1.5 Km)
Longest Canal	Indira Gandhi Canal
Longest River Bridge	Dhola-Sadia Bridge
State with the longest coastline in South India	Andhra Pradesh
Longest Railway Route	Dibrugarh to Kanyakumari (4218Km)
Longest Lake	Vembanad Lake
Longest Ruling dynasty	Chola dynasty (around 1300 to 1500 years)
Longest Cave	Krem Liat Prah