 Rivers_State  The inland part of the state consists of tropical rainforest, and towards the coast, the typical Niger Delta environment features many mangrove swamps. Rivers State has a total area of 11,077 km2 4,277 sq mi, making it the 26th largest state in Nigeria. Surrounding states are Imo, Abia and Anambra to the north, Akwa Ibom to the east and Bayelsa, Delta to the west. On the south, it is bounded by the Atlantic Ocean. Its topographyranges from flat plains, with a network of rivers to tributaries. 