was a town located in Mashita District, Gifu Prefecture, Japan. It had an area of 247.50 km².[1]
On March 1, 2004, the former town of Gero absorbed the towns of Hagiwara, Kanayama and Osaka, and the village of Maze (all from Mashita District) to create the city of Gero. Following this merger, Osaka became a district within the city of Gero.
Osaka located in the south-eastern region of Hida Province in a mountainous area at the base of Mount Ontake. Due to the steep slopes of Mount Ontake, the town resides at the bottom of a ravine formed by Hida River, Osaka River and their tributaries.
97% of the land is made up of forests, which contains a number of Tenpō-growth, such as the Hinoki cypress. More than 60% of these are nationally protected.
There are also many waterfalls, including Neo Waterfall. The town established a waterfall survey committee and, as a result of their investigation, it was determined that there were more than two hundred waterfalls with a height of more than 50NaN0. As a result, Osaka became known as the town with the most waterfalls within Japan.
The vicinity around Mount Ontake is designated as Mount Ontake Prefectural Nature Park.