Daiyatsugawa Dam

Masuma Dam is a gravity dam located in Chiba Prefecture in Japan. The dam is used for water supply. The catchment area of the dam is 2.2 km2. The dam impounds about 54 ha of land when full and can store 520 thousand cubic meters of water. The construction of the dam was started on 1966 and completed in 1969.

Awa Chuo Dam is an earthfill dam located in Chiba Prefecture in Japan. The dam is used for irrigation. The catchment area of the dam is 14.9 km2. The dam impounds about 20 ha of land when full and can store 2113 thousand cubic meters of water. The construction of the dam was completed in 1972.

Hirota-zeki is an earthfill dam located in Chiba Prefecture in Japan. The dam is used for irrigation. The catchment area of the dam is 0.8 km2. The dam impounds about 4 ha of land when full and can store 304 thousand cubic meters of water. The construction of the dam was completed in 1928.

Mount Atago (愛宕山, Atago-yama) is a mountain on the border of the cities of Minamibōsō and Kamogawa in Chiba Prefecture, Japan with an altitude of 408.2 m (1,339 ft). It is the highest point in Chiba Prefecture. Mount Atago is at the west of the Mineoka Mountain District of the Bōsō Hill Range. The kanji for Mount Atago, 愛 and 宕, mean 'love' and 'cave' respectively. The mountain is also known as Mineoka Atago-yama as several other hills and mountains share the same name in Japan, most notably Mount Atago in the Tamba Mountains to the northwest of Kyōto.

Mineoka Mountain District (嶺岡山地, Mineoka-sanchi) is an area in the Bōsō Hill Range in the southern part of Chiba Prefecture. The Mineoka Mountain District runs along an east–west line across the southern part of the Bōsō Peninsula from the southern bank of the Kamo River in Kamogawa, facing the Pacific Ocean, to the Sakuma District of Kyonan, facing Tokyo Bay. The highest peak in the mountain district is at Mount Atago 408.2 m (1,339 ft) Mineoka is formed from two kanji characters: the first "嶺", meaning 'peak' or 'summit' and the second "岡" meaning 'mount' or 'hill.'

The Bōsō Hill Range (房総丘陵, Bōsō-kyūryō) is a mountain range on the Bōsō Peninsula of Chiba Prefecture, Japan. The highest point in the Bōsō Mountain Range is at Mount Atago, with an altitude of 408.2 m (1,339 ft). The hill range runs from roughly in a line from Mobara or Ōamishirasato to Kisarazu, but is not formally defined. It is an important part of the Minami Bōsō Quasi-National Park.

Ichinosawa-zeki is an earthfill dam located in Chiba Prefecture in Japan. The dam is used for irrigation. The catchment area of the dam is 3 km2. The dam impounds about 4 ha of land when full and can store 346 thousand cubic meters of water. The construction of the dam was completed in 1951.

Komukai Dam is a gravity dam located in Chiba Prefecture in Japan. The dam is used for water supply. The catchment area of the dam is 11.3 km2. The dam impounds about 10 ha of land when full and can store 950 thousand cubic meters of water. The construction of the dam was started on 1972 and completed in 1975.

Maruyama (丸山町, Maruyama-chō) was a town located in Awa District, Chiba Prefecture, Japan. As of August 1, 2004, the town had an estimated population of 5,780 and a density of 131 persons per km2. The total area was 44.11 km2.

Tomiyama (富山町, Tomiyama-chō) was a town located in Awa District, Chiba Prefecture, Japan. As of March 20, 2006, the town had an estimated population of 5,841 and a density of 145 persons per km2. The total area was 40.34 km2.

Haccho-zeki is an earthfill dam located in Chiba Prefecture in Japan. The dam is used for irrigation. The dam impounds about 2 ha of land when full and can store 151 thousand cubic meters of water. The construction of the dam was completed in 1933.

Miyoshi (三芳村, Miyoshi-mura) was a village located in Awa District, Chiba Prefecture, Japan. As of March 20, 2006, the village had an estimated population of 4,560 and a density of 135 persons per km². The total area was 33.92 km².