The Kodaikanal–Munnar Road (old SH-18) was located in Dindigul District and Theni District of Tamil Nadu and Idukki district of Kerala in South India. It covers 81 kilometers (50 mi) from Kodaikanal to Munnar. The road was improved by the British in 1942 as an evacuation route in preparation for a possible Japanese invasion of South India. With a maximum elevation of 2,480 meters (8,140 ft) just south of Vandaravu Peak, it was among the highest roads in India, south of the Himalayas, prior to its closure in 1990.