The alluvial plain of the Kimabe River extends to the northwestern part of the town, however, most of the town's area is occupied by mountains that form part of the Kimabe Mountains.

Precipitation is significant throughout the year, and is heavier in summer, especially the months of June and July.

The villages of Kōyama and Uchinoura were established on May 1, 1889 with the creation of the modern municipalities system.

Kimotsuki has a mayor-council form of government with a directly elected mayor and a unicameral town council of 14 members.

In terms of national politics, the town is part of the Kagoshima 4th district of the lower house of the Diet of Japan.

Both wear purple outfits based on the traditional costume of the Yabusame Festival archer and have satellite heads.

Before the merger, the town of Uchinoura was a part of the Galaxy Federation, a chain of friendship cities that each house a JAXA space center.

It joined the federation as a founding member on November 8, 1987 and received the name the Republic of Uchinoura.

The most recent member of the federation, the city of Kakuda in Miyagi Prefecture, joined on April 2, 2016.