The topography of the city of Pangkapinang generally undulating and hilly with a height of 20-50 m above sea level and slope of 0-25 %. Morphologically concave regions in which the central part of the city located in the area is low. Hilly areas west and south of the cluster section Pangkalpinang city. Some of the main hill is Girimaya hill at an altitude of 50 m above sea level and Bukit Menara. While the urban forest area of ??290 ha located in the Old Village area Tunu Beautiful By Pangkalpinang be detailed land use; widely cultivated for dryland agriculture (food crops, smallholder plantations, fisheries and forestry) is an area of 1,562 hectares, while the land is not cultivated area of 1,163 ha and dry land utilized for residential area of 4,130 Ha. While the remaining 2,085 hectares are in the form of swamps, forests and other countries.
General state of Soil and Geology
Land in the area Pangkalpinang has an average pH below 5 with red-yellow podzolic soil types, regosol, Gleisol and organosol which is the weathering of the host rock. While on a small area of swamp land type association Alluvial - Hydromorf and Glayhumus and regosol dove originating from the deposition of sand and clay. Such circumstances are less suitable land to grow rice, but still allows for planting crops. In the suburbs, the Village and Village Air Itam Tuatunu potential yield of pepper and rubber. Geological conditions prevalent in this area; formation is the oldest -old limestone Permo Carbon, following the Upper Triassic age Slate and Granite intrusion final after the Triassic Jurassic age. The composition of granitic rocks varies from granite to dioditik with dark mineral inclusions are biotite and amphibole sometimes green.
In the region there are several rivers Pangkalpinang, in general, small rivers that exist in this area empties into the River Rangkui. In addition there is also a river Rangkui Pedindang River in the south. Both of these river serves as the main channel rain water disposal town which then flows into the River Baturusa and ends in the South China Sea. These rivers in addition to functioning as the main channel rain water disposal town, also serve as a transport stream of a market infrastructure to Baturusa River and continues into the sea. Creeks Rangkui an irrigation canal of water under the door to the sword bean Rangkui River built by the Dutch government in 1930. Source of water for clean water in general of groundwater in addition Beans Kolong Kolong Sword and Kace. Basically the city area Pangkalpinang judging morphologic concave where the lower part of the city center, so that this situation had a negative impact, which is prone to flooding, especially during the rainy season or the influence of the tide through the river that divides Rangkui Pangkalpinang. The areas that have never flooded located in the north, west and south of the city. While the eastern regions bordering the River Rangkui and the South China Sea and the central part of the city is traversed by the river Rangkui often flooded by the tide (rob), the flooded areas, especially the District Rangkui, Pangkal Balam and Taman Sari.