Jansenville is a town of 5,600 people (2011) in the Karoo region of South Africa. It is one of the biggest Mohair-producing regions in the world.
Jansenville is a small Karoo town established in 1855 and named after Jan Willem Janssens, Governor of the Cape Colony in 1803.
Jansenville sits on the banks of the Sundays River. It is north of the Zuurberg Mountains in an area known as the Noorsveld, after a cactus-like succulent that is common in the district. Between Jansenville and the Zuurberg to the south is a plain that marks the northern boundary of the Addo National Park, while to the north are some hills which have a scenic drive and, at the summit, shortly before the descent through the Ratelskloof Pass, there are views across the Camdeboo plains to the peaks of the Sneeuberg.
Jansenville is game country and in the area there are game farms, hunting concessions, and nature reserves including the Addo Elephant National Park.
Jansenville is 167 km north west of Port Elizabeth on the R75. It is 84km south of Graaff-Reinet.