On March 20, 2006, Mannō absorbed the towns of Chūnan and Kotonami, both from Nakatado District and changed its name to its current hiragana spelling.

Mannō has a mayor-council form of government with a directly elected mayor and a unicameral town council of 16 members.

In terms of national politics, the town is part of Kagawa 3rd district of the lower house of the Diet of Japan.

Shikoku Railway Company - Dosan Line Nestled in the mountains, this lake reservoir is one of the largest in Japan, with a volume of 15,400,000 m3.

[4] Kagawa has low rainfall, so rain dances and water reservoirs have been important throughout history, particularly for rice production.

In 821 the dam lay in disrepair and a larger version was built by the Buddhist monk Kūkai on the Emperor’s request.

There are flower gardens for all four seasons, forest walks, large-scale events, rent a cycles and other fun activities.

A photo contest, sketching and live jazz featured and there are sunflower seed ice-cream, croquettes, and salad dressing stalls.

During prayers to end a drought in 734, it is said that a white snake came out of a pond, turned into a dragon, flew up to heaven and called the rainclouds in to make it rain.

Mikadō onsen (美霞洞温泉, Mikado Hot Springs) was endorsed by the great 18th-century inventor Hiraga Gennai.