About 70% of the land in Japan has been formed by the mountains. It belongs to the Ring of Fire and its land is a part of the Asian monsoon region. Therefore, people's lives has been threatened by variety of disasters, volcanic eruptions, earthquakes, debris flow caused by heavy rain, landslide, collapse of cliff. The action to prevent from those disasters are called "Sabo" in Japan.

Fuji Sabo Office promotes 3 projects.
1. Prevention of sediment related disasters: Measures for Osawa Alluvial Fan and Measures for torrents at the southwest base of the mountain.
2. Volcanic Sabo investigation: Investigation for the prevention of sediment-related disasters caused by volcanic activities of Mt. Fuji.
3. Yui landslide control project: Landsilide control project directly supervised by the central gverment. The project site is very important for Japanese economic activity, because the National Route 1, Tomei Expressway and Tokaido Line which are a Japanese main artery exist along the narrow shoreline.