Termo sits at a critical junction in the high desert of Lassen County, where the iron-straight corridor of the railway meets a network of ranching roads. The settlement is defined by its position on the northern edge of the Madeline Plains, a vast, flat expanse that contrasts sharply with the prominent Termo Buttes to the northwest. This landscape illustrates the intersection of industrial transport and natural water sources, with vital points like Tunnel Spring and Fleming Spring scattered among the draws and canyons.
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1886 · Honey Lake
USGS Topo · 1:250,000
1891 · Honey Lake
USGS Topo · 1:250,000
1893 · Honey Lake
USGS Topo · 1:250,000
1954 · Karlo
USGS Topo · 1:62,500
1954 · Grasshopper Valley
USGS Topo · 1:62,500
1954 · Ravendale
USGS Topo · 1:62,500
1954 · Fredonyer Peak
USGS Topo · 1:62,500
1955 · Westwood
USGS Topo · 1:250,000
1958 · Westwood
USGS Topo · 1:250,000
1959 · Westwood
USGS Topo · 1:250,000