The Ngauranga Gorge is in the Wellington Region of New Zealand. State Highway 1 runs through the gorge, a vital link between Wellington City and the Kapiti Coast and the main route north out of Wellington. It is 2 kilometres long and has a grade of approximately 8%. 65,000 vehicles a day travelling through it, and it connects the Wellington Urban Motorway with the Johnsonville-Porirua motorway. The road up the gorge was upgraded in 1940 as the Centennial Highway. Ngauranga is a suburb of New Zealands capital city, Wellington, in the lower North Island. ... A gorge is a narrow passage between steep mountains or hills. ... The Wellington region of New Zealand occupies the southern end of the North Island. ... State Highway 1 State Highway 1 is the most significant single element of the New Zealand roading network State Highway 1 can be considered as a single highway running the length of both main islands, a total of 2027 km. ... For other uses, see Wellington (disambiguation). ... Kapiti Island seen from Waikanae Beach, Kapiti Coast. ... The Wellington Urban Motorway, part of SH1, is the major road into and out of Wellington, New Zealand. ... Johnsonville is the name of some places in the United States: Johnsonville, Illinois Johnsonville, South Carolina Johnsonville Township, Minnesota And in New Zealand: Johnsonville, New Zealand This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... Porirua is a city in New Zealand, 20 km north of Wellington. ...

The Newlands Interchange, at the top of the gorge, was constructed in 1997/1998 to replace a simple junction, which caused a large amount of congestion.

The North Island Main Trunk Railway crosses the bottom of the gorge via an overbridge between the Tawa No 1 and Tawa No 2 Tunnels of the Tawa Flat deviation. The North Island Main Trunk Railway (NIMT) is the railway line connecting Auckland and Wellington, the two major cities of New Zealands North Island. ... The Tawa Flat deviation is a double-track section of the North Island Main Trunk Railway (NIMT) just north of Wellington, New Zealand. ...

There is an industrial area with some retail outlets at the bottom of the gorge, where there was previously an abattoir. There are an abattoir and quarry part way up the gorge.