Baldwin Street in a suburban part of New Zealand's southern city of Dunedin, is considered the world's steepest residential street. It is located in the suburb of North East Valley, 3.5 kilometres (2.2 mi) northeast of Dunedin's city center.

A short straight street a little under 350 metres (1,150 ft) long, Baldwin Street runs east from the valley of the Lindsay Creek up the side of Signal Hill towards Opoho, rising from 30 m (98 ft) above sea level at its junction with North Road to 100 m (330 ft) above sea level at the top, an average slope of slightly more than 1:5. 

Its lower reaches are only moderately steep, and the surface is asphalt, but the upper reaches of this cul-de-sac are far steeper, and surfaced in concrete (200 m (660 ft) long), for ease of maintenance (bitumen, in either chip seal or asphalt, would flow down the slope on a warm day) and for safety in Dunedin's frosty winters. At its maximum, the slope of Baldwin Street is about 1:2.86 (19° or 35%). That is, for every 2.86 metres travelled horizontally, the elevation changes by 1 meter.

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