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The Scottsdale McDowell Sonoran Preserve is a large, permanently protected, sustainable desert habitat in Scottsdale, Arizona. The preserve encompasses some 30,500 acres (12,343 ha) contiguously, and is the largest city park (technically "nature reserve") in the United States. The preserve lands were purchased via a sales tax increment approved by Scottsdale voters, and the preserve is supported in-part by the McDowell Sonoran Conservancy.