The Wassa are Akan people who live predominantly in Ghana. One of the best-known Wassa towns is Tarkwa, one of the highest producers of gold and Cocoa in Akanland. Some other Wassa towns are: Samreboi, Asankrangwa, Manso-Amenfi, Wasa Akropong, Ankwaso, Amoanda, Bawdie, Oppong Valley, Nkonya, Bogoso, Prestea, Huni Valley, Aboso, Daboase, Nsuta, Nsuaem, Ateiku, Ango, Apemenyim, Benso, Wassa Simpa, Mpohor, Adum-Dominase, Trebuom, Amuzukrom,Manso, and Adum-Banso . Adum-Banso, for instance, was founded in 1811, and its former territorial control stretched from its present location to Takoradi, until it was defeated in the Ahanta wars. The King of Adum-Banso, Nana Kwandoh Brempong I poured libation for the construction of Takoradi Harbour in 1927 in recognition of the town's former status as a dominant force in Wassa territorial control. Adum-Banso is also home to the largest oil palm plantation in the Western region of Ghana - the Benso Oil Palm Plantation, Adum-Banso Estates, established by UNILIVER in 1976,but now owned by WILMAR. There is also large deposits of Iron and Gold in Adum-Banso, which are untapped, a testimony to an area rich in mineral resources.Wassa is the largest tribe in Western Region in terms of land and population. Wassa's land covers 9,638 km2 almost the same as Central Region (9,791 km2). Western Region covers 24,293 km2. They are the only Twi speaking people in Western Region, a language simply known as Wassa, which is closer to "Bono ", a language spoken by the people of Brong-Ahafo region of Ghana. In spite of its similarities, Wassa as a language is idiosyncratic.
Olson, James Stuart (1996). The peoples of Africa: an ethnohistorical dictionary. Santa Barbara, CA: Greenwood Press. pp. 589–590. ISBN 978-0-313-27918-8. Retrieved 18 April 2010.
Aidoo, Daniel Ato, (2015), Defining Wassa.