Arlington County, Virginia area. The county is situated in Northern Virginia on the southwestern bank of the Potomac River directly across from Washington, D.C., of which it was once a part. With a land area of , Arlington is the geographically smallest self-governing county in the U.S., and by reason of state law regarding population density, has no incorporated towns within its borders. Due to the county's proximity to downtown Washington, D.C., Arlington is home to many important installations for the capital region and U.S. government, including the Pentagon, Reagan National Airport, and Arlington National Cemetery. Many schools and universities have campuses in
Arlington County, Virginia completed in 2009. At the time of completion, the Turnberry Tower was tallest residential building in the Washington metropolitan area. In 2017, Nestle USA chose 1812 N Moore in Rosslyn as their US headquarters. In 2018, Amazon.com, Inc. announced that it would be splitting its "HQ2" second headquarters project between Arlington and Long Island City, New York. The Arlington HQ2 site is planned for the Crystal City neighborhood, anchoring a broader area of Arlington and the City of Alexandria that was simultaneously rebranded as National Landing. Arlington County is located in northeast Virginia and is surrounded by Fairfax County and