45th parallel south

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The 45th parallel of south latitude is the east-west line that marks the theoretical halfway point between the equator and the South Pole. (The true halfway point is somewhat south of this parallel because the Earth is not a perfect sphere but bulges at the equator and is flattened at the poles.[1])

Unlike its northern counterpart it passes mostly over open ocean. The exceptions are the southern end of South America where it crosses the Aisén Region of Chile and Chubut Province of Argentina, and southern New Zealand where it crosses the South Island immediately north of Oamaru.