Lava Beds National Monument is located in northeastern California, in Siskiyou and Modoc counties. The monument lies on the northeastern flank of Medicine Lake Volcano and has the largest total area covered by a volcano in the Cascade Range.

The region in and around Lava Beds National Monument lies at the junction of the Sierra-Klamath, Cascade, and Great Basin physiographic provinces. Th... Wikipedia

Hedge Creek Falls is a waterfall on Hedge Creek, in the Shasta Cascade area in Dunsmuir, California. There is a small cave located behind the waterfall, allowing visitors to walk behind the cascading water. Shortly after the waterfall, hedge creek flows into the Sacramento River south of Mossbrae Falls. There is a viewing platform over the river, with a view of Mount Shasta. Access to the waterfal... Wikipedia

Lake Siskiyou is a reservoir formed by Box Canyon Dam on the Sacramento River, in far northern California, near the town of Mt. Shasta, California. It is the site of local recreation, as well as being used for watershed protection and flood control. Wikipedia

The Sacramento River (Spanish: Río Sacramento) is the principal river of Northern California in the United States and is the largest river in California. Rising in the Klamath Mountains, the river flows south for 400 miles (640 km) before reaching the Sacramento–San Joaquin River Delta and San Francisco Bay. The river drains about 26,500 square miles (69,000 km2) in 19 California counties, mostly... Wikipedia

Pluto's Cave (or Pluto Cave) is a partially collapsed lava tube on the northern outskirts of Mount Shasta in the Klamath National Forest. Its main entrance is located close to the 99-97 Cutoff c. 12 miles (19 km) North-east of Weed and c. 14 miles (23 km) East-southeast of Grenada. The tube is roughly 190,000 years old, which is quite old for a lava tube, as they normally collapse quickly (in geol... Wikipedia