The Koori Castle ruins site is located in Hebinumayama, Sanbongi Koori, Osaki City, Miyagi Prefecture. The castle was resided by Shibuya Sagaminokami, a retainer of the Osaki clan, during the Warring States period (1493-1573). After the area was ruled by the Date clan, Shibata Muneyoshi, the father of Oyama-no-kata, one of Date Masamune’s concubines, temporarily resided in the castle.

Fortified with the Naruse River and the steep cliff facing deep mountains, it was presumably an impregnable castle. The ruins site is arranged into Tateyama Park, from which you can command a panoramic view of rice paddies in Osaki Plain. It is famous as a cherry blossom viewing spot. In spring, 900 old cherry trees beautifully come into bloom.