Waitaki District is a territorial authority district that is located in the Canterbury and Otago regions of the South Island of New Zealand. It straddles the traditional border between the two regions, the Waitaki River, and its seat is Oamaru.

Omarama is a small town at the junction of State Highways 8 and 83, near the southern end of the Mackenzie Basin, in the South Island of New Zealand. Omarama is in the Waitaki District, in the southern Canterbury region. The Ahuriri River is a short distance to the north of the township. Omarama is 30 km southwest of Twizel, 40 km southeast of Lake Ōhau and 32 km northeast of the Lindis Pass.