Streetdirectory.com The Regalia is located in River Valley district, Singapore. Surrounding the Singapore River, River Valley is located within the Central Business District comprises mainly luxurious condominiums. During the day, this district is bustling with commercial activity due to the many companies located here. The Ministry of Manpower Occupational Safety & Health Centre and the Employment Inspectorate are also in River Valley. During the night, this district transforms to become a vibrant nightlife spot found mostly in the Robertson Quay area. Zouk Singapore, one of the more popular clubs, is in the vicinity, as is Great World City, a large shopping center. Another popular spot in River Valley District is Killiney Road where you get the famous Cafes such as Killiney kopitiam.