Greater Antananarivo is a continuous, urbanized area spreading beyond the city's official boundaries for  north to south between Ambohimanarina and Ankadimbahoaka, and  west to east between the Ikopa River dike and Tsiadana. The population of the greater Antananarivo area was estimated at 3 million people in 2012; it is expected to rise to 6 million by 2030.