This is a RPPC Photograph of Inside the " Lava Cave, near Bend, Oregon". It is marked Photo Art Camera Shop, Bend, Ore. This card is in pristine condition and measures 3 3/8" by 5 3/8". The scarcity and spaciousness of Central Oregon's Lava Lands create an area of striking beauty both above and below ground. Large areas are covered by lava flows. These rivers of rock are basalt, a molten lava that spreads quickly and sometimes flowed up to seventy miles. Great tunnels wind through many of these flows and suggest that awesome forces of nature were once at work. These ancient lava tunnels (called tubes) are one of the area's most interesting secrets. Lava River Cave is one example of these ancient lava tunnels. The cave is part of Newberry National Volcanic Monument, which managed by the U.S. Forest Service. The cave temperature is a constant 42 degrees. The one mile cave is one of the longest lava tubes in Oregon.