National Highway 209 links Dindigul
in Tamil Nadu
. Of its total length of 456 km, 286 km is in Tamil Nadu and the rest in Karnataka. The highway starts at the junction of National Highways 45, 49 and 7 at Dindigul. It then travels north-west till Pollachi
and turns north-east, passes Coimbatore
and Satyamangalam, before leaving Tamil Nadu near Talavadi.
, Udumalaipettai and Mettupalayam
are other major towns that lie along the National Highway 209 in Tamil Nadu side.
are the prominent towns lying along NH 209 in Karnataka.