The boundaries of modern-day Jurong were first demarcated in the 1960 proposal of the new town. The planned town was to be located entirely south of Jurong Road, combining land that was once the colonial era districts (mukims) of Peng Kang, Pandan and the southernmost portion of Choa Chu Kang. As a result of this proposal, the government gazetted portions of land from these areas to increase the overall size of Jurong. These boundaries were later further defined with the introduction of the URA 1991 Concept Plan in September 1991.