Amruthur is a town (hobli) in Kunigal taluk, Tumkur district, Karnataka, India. It is situated in a valley created by the rivers Shimsha, Veera-vaishnavi and Nagini. It is irrigated by the Markonhalli and Mangala reservoirs and a series of tanks. Amruthur is surrounded by paddy fields and areca-nut gardens. To the south of the village are two lakes that also serve as a source of irrigation.Amruthur is at a distance of 73 k.m. from the state capital, Bangalore.