This Natural Area is south of Olympia just west of I-5. There are a number of walking trails through the mounds and a lot of signs explaining the history of the area. It’s pretty amazing. There are approximately 8-10 mounds per acre, measuring 1–7 feet (0.30–2.13 m) in height and having diameters 8–40 feet (2.4–12.2 m). The origin of the mounds is unknown with a number of alternate hypotheses including shaking from earthquakes while glacial outwash material is uncompacted, animal (gopher, etc) construction and windblown sediment accumulation around plants, among others. Regardless of origin, they make a very interesting walk.
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