
The Willamette River meanders across the southern landscape of this region, defining the borders between Marion, Yamhill, and Clackamas counties. Higher elevations like Parrett Mtn and Ladd Hill provide a counterpoint to the low-lying Onion Flat and the wetlands preserved within the Tualatin River National Wildlife Refuge. The settlement pattern reflects deep roots in the Willamette Valley, with established centers at Sherwood, Tualatin, and Wilsonville connected by historical transport corridors like the Portland & Western RR.
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This is the sole edition of this map. No revisions or reprints were ever made.
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