The Diamond Craters Keyhole Crater, located in the Donner und Blitzen watershed of Oregon, is a popular destination for visitors who enjoy hiking and exploring volcanic landscapes. The crater itself was formed by a volcanic explosion thousands of years ago and is now filled with water, creating a stunning blue-green pool that is surrounded by steep cliffs. Visitors can hike around the rim of the crater, taking in the breathtaking views of the surrounding landscape and potentially spotting wildlife such as eagles, hawks, and coyotes.

One of the unique features of the Diamond Craters Keyhole Crater is the abundance of obsidian, a naturally occurring volcanic glass that was highly valued by Native American tribes for use in tools and weapons. Visitors to the area may be able to find obsidian fragments scattered around the crater and surrounding landscape, adding an element of archaeological interest to the visit. Other notable features of the area include lava tubes, which are underground tunnels formed by flowing lava, and the nearby Diamond Craters themselves, which are a series of smaller volcanic craters that offer additional hiking opportunities and stunning views of the surrounding landscape.