Hongo Storage Reservoir is located by the Hongo River, which connects to the Yodo River, in Uda, Nara Prefecture.
  
Hongo Storage Reservoir is for the supply of water to agricultural areas in the west and north districts of Ouda town and was made by damming the Hongo River, whose source is Mt Otowa. The total storage capacity of the reservoir is 300,000m3.
  
Storage reservoir agriculture has been popular in the Nara Basin since even before the Meiji period, when many storage reservoirs were built. Hongo was built in 1935 and is a relatively new one.
  
There is an observation terrace at the reservoir where you can see the whole district. Many fish, such as the hera, can be found here, and it is a popular place for fishing.
  
Hongo Storage Reservoir is also famous for cherry blossom which, in April, are reflected on the surface of the reservoir.

Ogata Iro is a watercourse that was once used for irrigation and that passes through the town of Ogata in Oita Prefecture.

The upper part of Ogata Iro was constructed in 1645 and the lower part in 1671, giving the watercourse its present shape. This agricultural watercourse was a lifeline from the mid-Edo period to the 1960s as it irrigated the fields belonging to the Ogata clan.

At one time the watercourse became polluted with domestic waste, but following a cleanup program in 1985, it even became a place used by children for swimming from the 1990s. Also, after the cleanup, fireflies started to appear. The watercourse and the watermill create a refreshing watery scene.