Newberry National Volcanic Monument, Nature reserve in Deschutes County, US.

Newberry National Volcanic Monument is a large protected area in central Oregon featuring volcanic fields, lava flows, cinder cones, and two lakes within the Newberry Caldera. The landscape displays multiple forms of volcanic activity, from dark lava surfaces to vast underground tubes of hardened lava.

Excavations at Paulina Lake show that Paleo-Indians visited the caldera about 10,000 years ago, and its obsidian flows supplied stone for scrapers and blades. The crater became part of Deschutes National Forest in 1908, and Congress designated the national monument in November 1990. The Lava River Cave, discovered in 1889, was given to Oregon in 1926 as a state park and traded back to the Forest Service in 1981.

Excavations at Paulina Lake show that Paleoindians visited the caldera about 10,000 years ago. The East Lake and Big Obsidian Flow deposits supplied obsidian that was worked into scrapers and blades, and the name of the monument honours John Strong Newberry, geologist on an 1857–58 US Army survey of possible railroad routes.

The site has twelve marked trails of varying difficulty, ranging from short walks to full-day hikes that require good fitness. Access is easiest during warmer months when roads and paths are fully open and snow is not blocking the way.

The Big Obsidian Flow is a striking black glass surface created by a volcanic eruption around 1,300 years ago that covers a large expanse. Walking across this dark glassy plain reveals how sharp and brittle the volcanic obsidian can be underfoot.