Located in the transition zone between highland and Mekong delta, HCM city has an average elevation of to m. In the Southeast, the city is boundered by the sea with a coastline of 30 km. Thus, HCM city often suffered from inundation especially in the rainy season and tide high period. Land subsidence possibly resulted from groundwater over-extraction had been doubted since some manifestations of ground surface sinking were observed at the well fields in the districts No. 6 and Binh Tan in 2004. | Assessment of land subsidence due to groundwater extraction in Ho Chi Minh city
