Article Detail Which is Longest national highway of India ? Answer: NH-7 ( Varanasi to Kanyakumari - 2,369 km) Similar Questions : 1. Which is the highest dam in India ? Answer: Tehri Dam on Bhagirathi River in Uttarakhand (Height of 260 metres) 2. Which is smallest and largest bird ? Answer: Smallest Bird is Humming Bird and Largest bird is Ostrich 3. Which is the Largest lake of the world ? Answer: Caspian Sea (371,000 sq km) 4. Which is the highest waterfall in the world ? Answer: Angel, Venezuela 5. Which is the largest Mosque in World ? Answer: Masjid al Haram (Saudi Arabia) 6. Which is Longest Dam in India ? Answer: Hirakod Dam (Orissa) 7. Longest rail tunnel in the world ? Answer: Seikan Tunnel (Japan - 53.9 Km) Read more from - Longest and Largest