Kanchiyar, India
Anchuruli, also spelled Anjuruli, is a popular tourist destination located in Kanchiyar panchayat in Idukki district, Kerala state, India. Anchuruli is famous for the 5.5 km (3.4 mi) long circular tunnel that carries water from Erattayar dam to Idukki reservoir.
Listen to the audio guide for Anchuruli Tunnel Free on WIP — starts by itself when you arrive, even with the screen off