The Takamori Line is a Japanese railway line in Kumamoto Prefecture, between Tateno Station, Minamiaso, and Takamori Station, Takamori. This is the only railway line Minamiaso Railway operates. The line traverses the southern part of Mount Aso caldera.

Kumamoto Prefecture is a prefecture of Japan located on the island of Kyūshū. Kumamoto Prefecture has a population of 1,748,134 and has a geographic area of 7,409 square kilometres (2,861 sq mi). Kumamoto Prefecture borders Fukuoka Prefecture to the north, Ōita Prefecture to the northeast, Miyazaki Prefecture to the southeast, and Kagoshima Prefecture to the south.