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2.1 History <br />Pre -Founding <br />Pleasanton rests in the scenic Tri -Valley area of Alameda <br />County, north of San Jose and east of San Francisco. <br />Pleasanton is surrounded by the East Bay hills to the west, <br />Altamont Hills to the east, and Diablo Range to the north <br />A <br />CONTEXT U <br />and south. Historically, the Pleasanton area was located on <br />a vast marsh complex surrounded by seasonal wetlands <br />(see Figure 2-1) that supported a mix of open water ponds, <br />freshwater marsh, and dense willow thickets, which provided <br />habitat for a wide range of flora and fauna species. <br />Figure 2-1.1880 Habitat map overlay showing where the historic marsh complex existed before the City was developed <br />Valley Freshwater Marsh <br />Pond <br />Willow Thicket <br />Source: San Francisco Estuary Institute, 2013 <br />Y� <br />n.,..r i -r. �\ <br />D: 1880 <br />CITY OF PLEASANTON URBAN FOREST MASTER PLAN i 45 <br />