742-acre (3.00 km²) Upper St. Regis Lake is a part of the St. Regis River in the Adirondacks in northern New York State. Along with Lower St. Regis Lake and Spitfire Lake, it became famous in the late 19th century as a summer playground of America's power elite, drawn to the area by its scenic beauty and by the rustic charms of Paul Smith's Hotel. It is the site of many grand old summer "cottages" and Great Camps, including Marjorie Merriweather Post's Topridge. Frederick W. Vanderbilt, Anson Phelps Stokes and Whitelaw Reid were among the summer residents.