The Tarkwa Nsuaem municipality is one of the 23 administrative MMDA,s in the Western Region of Ghana. It was established by legislative instrument 1886 in the year 2008. The Assembly was formed out of erstwhile Wassa West district when it was divided into Tarkwa Nsuaem Municipal Assembly and Prestea Hunivalley District due to increased in population and economic activities. The Municipality lies within the South-Western Equatorial Zone and has uniform temperature, ranging between 26oC in August and 30oC in March. The Tarkwa Nsuaem Municipality experiences one of the highest rainfall patterns in Ghana. It has a mean annual rainfall of 187.83cm with a double maximum rainfall starting from March to September as the main rainfall season and October to February as the dry season. This has an important effect on the environment in creating watersheds, large expanses of stagnant water bodies, deep trenches and gullies as well as leaching the nutrient content of the soil.
The high precipitation experienced in the Municipality supports plant growth without irrigation. Rain water becomes the main water source for agricultural activities which continues throughout the year. Geographical Tarkwa Nsuaem is located between Latitude 4 minutes, 5 second west and Longitude 5 minutes 5 seconds north and shares boundaries with Prestia Huni-Valley District to the north, Nzema East District to the West, Ahanta West District to the South and Mpohor Wassa East District to the East.
The Municipality has a total land area of 978.26 sq. km sub divided into 6 local administrative areas known as Urban/Area Councils. Namely Benso Area Council, Simpa Area Council, Nsuta Area Council, Dompim Area Council, Nsuaem Area Council and Tarkwa Urban Council.
The Municipality in terms of trade is strategically positioned to be able to transact business with all the four districts it shares boundaries with. The location of the Municipality makes transportation of goods and services easy to and fro other districts and regions thereby boosting economic activities which in turn, lead to an increase in per capital income of people in the municipality.
The Municipal capital Tarkwa is a mining town, hosting three major mining companies namely Goldfields Ghana Limited, AngloGold Ashanti-Iduapreim mine and Ghana Manganese Company. As a result of activities of these thousands of people travel far and near to Tarkwa in search of job whiles other visit the town to render special jobs to the companies.