You can see the Kamiyama and Kanmurigatake mountains from the caldera rim, near the eastern exit of Nagao tunnel.
The landscape that the golf courses are on is shaped like a clamshell, formed by the collapse of Mt. Kamiyama about 3000 years ago.
To the east of Nagao-toge Pass, you can see an outcrop of a lava flow dipping towards the center of the caldera. The discovery of the outcrop helped reconstruct the geology of Hakone.