Chausuyama is located inside Tennoji Park. During the Siege of Osaka (Winter Campaign), it is said to have been Tokugawa Ieyasu’s main camp, and in the Summer Campaign it became Sanada Yukimura’s main camp—making it the site of the “Battle of Chausuyama.” It was once thought to be a keyhole-shaped kofun (tumulus) from around the 5th century, and the adjacent Kawasoko Pond was believed to be a remnant of its moat. However, an excavation survey in 1986 confirmed traces such as camp remains, buildings, and trenches, casting doubt on the theory that it was a massive 200-meter-long keyhole-shaped tomb. Visually, it looks like a small, island-like hill surrounded by nature and the pond. Despite the name, it is only about 26 meters high, so it can be easy to overlook—hence a stone marker clearly identifying it as Chausuyama remains as evidence of the historical site. Because it is in Tennoji Park, about a 5-minute walk from Tennoji Station on the Osaka Metro Midosuji Line and the JR Loop Line, many people visit while strolling or walking. It can be viewed year-round, with park hours from 7:00 to 22:00.