Ueshi Castle Ruins are located on Mt. Ueshi, which stands 372 meters above sea level. A modern keep was built in 1990. At the summit, the ruins of koguchi (a castle entrance) and kuruwa (areas divided by earthworks, stone walls, and moats) have also been identified. The area is now maintained as a park, featuring an observatory, a parking lot, and restrooms at the trail entrance. From the castle ruins, visitors can enjoy a panoramic view of Yurihama Town and the Sea of Japan.