Lassen Peak, California, USA
U.S. Geological Survey photo by Dwight Crandell (fair use policy)
Lassen Peak is the southernmost volcano of the Cascade Range, which stretches north to Mount Garibaldi in British Columbia. It last erupted in 1917. Here's a detailed report on part of that eruption sequence. For much more geologic information about Lassen, visit the USGS's Lassen Peak menu.
