Mount Komaki, Historic summit in Horinouchi, Japan

Mount Komaki is an isolated 86-metre hill in the Nōbi Plain, measuring about 600 m east to west and 400 m north to south, with a summit topped by a 1967 building modelled on Nishi Hongan-ji's Hiunkaku Pavilion. The slopes are cut into terraces and ringed by stone walls and dry moats, and the wooded crest appears as a small castle-like structure above the town.

Oda Nobunaga built Komakiyama Castle on this site in 1563 to serve as a military base during his campaigns in the region. The castle was central to conflicts over control of Mino Province during that era.

The mountain serves as a gathering place in spring when people visit for the Cherry Blossom Festival and spend time beneath flowering trees. Locals and visitors value it as a space where nature and community come together in the region.

The summit is a 20-minute walk from Komaki Station on the Meitetsu Komaki Line. The Komaki City Historical Museum in the faux keep opens from 9:00 to 16:30 and closes on the third Thursday of each month and over the New Year holidays. The museum's top floor serves as an observation room over the Nobi Plain.

The summit building is not a reconstruction of the castle: it was built in 1967 by the businessman Shigeru Hiramatsu, who modelled it on the Hiunkaku Pavilion of Nishi Hongan-ji in Kyoto and then donated it to the city. It houses the Komaki City Historical Museum, with samurai armour, swords, early firearms and roof tiles found in the castle grounds.