Also a famous cherry blossom spot, Osada Park is situated less than five kilometers southeast from the city center of Nakatsu and is surrounded by water and greenery. This area is a shrine garden. At its center is Misumi Pond, in which there is a temple gate, showing the beautiful Komo Shrine and Osada Hachimangu Shrine.

　The pond is artificial, and its name originally meant Triangle Pond because the surface of the water appeared to have three corners when seen from the embankment, but it was given a better name meaning Clear Pond. It is also known as Komo Pond. It is believed that the god of Usa rested on a mat pillow made of straw that grew near the pond, and straw was cut here as part of a ceremony. In other words, this is a sacred pond where a god dwells and is one of the original shrines of Usa.

　Komo Shrine was built with the pond as an object of worship containing a god, so the building is, so to speak, a hall of worship. The current shrine was rebuilt in the early 17th century by Tadaoki Hosokawa, lord of the Nakatsu Clan, and the tower gate (Nationally Designated Important Cultural Property), reconstructed by another clan lord named Nagatsugu Ogasawara, is also magnificent, with its red color reflecting beautifully against the water of the pond and the surrounding greenery.

　The people who worshiped the god of Usa were a people originally from continental Asia who introduced agriculture and culture to ancient Japan, and are believed to have moved to the Nakatsu and Usa area from northern Kyushu. This group of people brought cutting-edge technology of the day from the Korean Peninsula.

　This technology included metal refining and processing as well as civil engineering. Misumi Pond was built with this technology, as were several reservoirs large and small in the area, such as Oike Pond.

　With this, many of our ancestors later began drawing water from rivers such as Yamakuni River and Yakkan River, creating a network of water using ponds and wells across the plains from Nakatsu to Usa, creating the current granaries.

　Misumi Pond is not only a god but the origins of irrigation in Japan, and could be considered the original reservoir among the densely distributed reservoirs not only in Oita Prefecture but in northern Kyushu to Shikoku, the Seto Inland Sea coast of Chugoku, as well as Kawachi and the Yamato Plains.