Since 2009, the names of planets from the "Dune" novels have been adopted for the real-world nomenclature of plains (planitiae) and complexes of valleys (labyrinthi) on Saturn's moon Titan. Planet names used to date include Arrakis, Caladan, Giedi Prime, Kaitain, Salusa Secundus, and Tleilax. The Hagal dune field and other sites on Mars are informally named after planets mentioned in the "Dune" series. The city of Tacoma, Washington, Herbert's birthplace, dedicated part of Point Defiance Park as the ""Dune" Peninsula" to honor the writer and the series.