Mariental lies 232 km north of Keetmanshoop and 274 km southeast of Windhoek near the Hardap Dam, the largest water reservoir in Namibia. The town and the surrounding area are in a hot, arid region.
The nearby Hardap Dam provides water for irrigation, making possible to cultivate animal fodder, as well as corn, fruits and vegetables. The town is surrounded by flourishing commercial farms which, due to the low annual rainfall in the area focus on game farming as well as sheep and ostrich farming which along with cattle farming remain popular in the region.
Sitting astride the main route into the Kalahari and Namib Deserts, Mariental also services the needs of farmers in these areas. Mariental also boasts some of the best safari and hunting experiences in Namibia at lodges. Available game include springbuck, blesbuck, giraffe, ostrich, leopard, zebra, kudu, gemsbuck, hartebeest, eland, blue- and black wildebeest.