Ciudad Colonial (Spanish for "Colonial City") is the historic central neighborhood of Santo Domingo and the oldest permanent European settlement of the New World. It has been declared a World Heritage Site by UNESCO. It is colloquially known as "Zona Colonial" (Colonial Zone). The Ciudad Colonial is located on the west bank of the Ozama River, which bisects the city. It covers less than 5 square kilometers.
It is an important section of the city due to the high number of landmarks, including Alcázar de Colón, Fortaleza Ozama, Catedral Primada de America, and others.(Wikipedia)