An interesting mound area can be seen on the topographic data off the coast of California.  Hundreds of "mound-like" features are clustered close to each at approximately 20 miles from land, heading due west from the shoreline. The closest city is Salinas, CA.  The features all seem to be a similar width of around 500 feet.

Topographic Mound Features: CA Area 1

Topographic Mound Features: CA Area 2

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