The municipality covers an area of 2,011 square kilometres (776 sq mi) on the coastal plain between the Outeniqua Mountains and the sea. It stretches from the Gourits River in the west to beyond the Great Brak River in the east. It is drained by the Gourits, Hartenbos, Little Brak and Great Brak Rivers. It abuts on the Hessequa Municipality to the west, the Oudtshoorn Municipality to the north and the George Municipality to the east.

According to the 2011 census the municipality has a population of 89,430 people in 28,025 households. Of this population, 43.5% describe themselves as "Coloured", 29.5% as "Black African", and 25.5% as "White". The first language of 67.6% of the population is Afrikaans, while 21.5% speak Xhosa, 6.5% speak English and 1.3% speak Sotho.

The principal town is Mossel Bay on the Cape St Blaize peninsula, which as of 2011 has a population of 59,031. Northeast of Mossel Bay is a string of coastal resorts along the shores of the bay: Hartenbos (pop. 4,196), Little Brak River (pop. 2,037), Reebok (pop. 1,112), Tergniet (pop. 1,264) and Great Brak River (pop. 10,619). To the southwest of Mossel Bay are the smaller coastal villages of Boggomsbaai (pop. 69) and Vleesbaai (pop. 193). Herbertsdale (pop. 666), Brandwacht (pop. 1,470) and Friemersheim (pop. 1,235) are situated in the interior of the municipality closer to the mountains.

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