Streetdirectory.com HDB Rivervale is in Sengkang, Singapore. One of the newest residential estates of Singapore HDB flats and condominiums, Sengkang's immaculate urban planning consists of uniform architecture. All the apartments and schools, such as Nan Chiau High School, are in strategic locations. The modern LRT train tracks can be seen across the district, creating a new age feel. There is also a major shopping centre, Compass Point in Sengkang. A river, Sungei Punggol, runs through the estate, and is perhaps the only remaining landmark of historical value.