Oliver Lake - a sag pond

USA / California / Guerneville /
 lake, pond
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Sag ponds are formed by earth movement along earthquake faults. In this case the San Andreas Fault that destroyed much of San Francisco in 1906. The area and shape vary with rainfall and evaporation
Nearby cities:
Coordinates:   38°35'39"N   123°18'46"W
This article was last modified 13 years ago