Rufiji Basin Water Board (RBWB) was established in 1993 under the Water Utilization (Control and Regulation) Act No. 42 of 1974 and its subsequent amendments. This Act was repealed and replaced by the Water Resources Management Act No. 11 of 2009 following its ammendment (Water Resource Management Act No 8 of 2022) . The Basin covers an area of 183,791 square kilometres (about 20% of Tanzania Mainland).  The river drains into the Indian Ocean.  The Basin is situated between Longitudes 33^o55’E and 39^o25’E and between Latitudes 5^o35’S and 10^o45’S.  Since the boundary of the Basin does not follow administrative boundaries, Eleven Regions are covered namely Iringa (the wholly covered region), and the partly covered regions are Mbeya, Dodoma, Singida, Tabora, Morogoro, Ruvuma, Njombe, Lindi, Dar Es Salaam and PwaniRufiji Basin Water Board (RBWB) was established in 1993 under the Water Utilization (Control and Regulation) Act No. 42 of 1974 and its subsequent amendments. This Act was repealed and replaced by the Water Resources Management Act No. 11 of 2009. The Basin covers an area of 183,791 square kilometres (about 20% of Tanzania Mainland).  The river drains into the Indian Ocean.  The Basin is situated between Longitudes 33^o55’E and 39^o25’E and between Latitudes 5^o35’S and 10^o45’S.  Since the boundary of the Basin does not follow administrative boundaries, Eleven Regions are covered namely Iringa (the wholly covered region), and the partly covered regions are Mbeya, Dodoma, Singida, Tabora, Morogoro, Ruvuma, Njombe, Lindi, Dar Es Salaam and Pwani. 

Below is the map that shows the area covered by Rufiji Basin Water Board