 Today Shuri Castle has been reconstructed, including the famous Shureimon, its main gate, and is registered, along with a number of other "gusuku" and other Okinawan historical and sacred sites, as a UNESCO World Heritage Site.Lake Man, covered with mangrove woods on the boundary of the city of Tomigusuku, is listed on the Ramsar list of wetlands.Four universities are in the Naha area.