The Pacific Border Province is a long region running along the western margin of the United States, as the name implies. It can be divided into two distinct types of topography: lowlands and mountains. The lowlands are in the form of a trough on the eastern side of the region, separated in the middle by the Klamath Mountains. The Puget trough slopes to the north, eventually plunging into the waters of Puget Sound. It was covered by ice during the Pleistocene and is underlain by glacial deposits. The California trough to the south is underlain by alluvial sediments and is one of the world’s most productive agricultural areas.
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