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Orleans, county, northwestern New York state, U.S., comprising a lowland region that is bordered by Lake Ontario to the north. It is intersected by the New York State Canal System (and its constituent Erie Canal) and by Oak Orchard Creek. The primary species of tree is oak. Attractions include Lakeside Beach State Park, Oak Orchard State Marine Park, Medina Terminal State Canal Park, and Iroquois National Wildlife Refuge. Erie and Seneca Indians inhabited the region...