Muriwai Beach is situated at the southern end of a 50-mile stretch of black-sand beach.
The black sand is caused by the iron content derived from the ancient volcanoes in the area, including the large "Kaipara Volcano" which was situated offshore from the Kaipara Heads, and erupted 23-16 million years ago.[4] The black sand is moved up the west coast of the North Island by longshore drift.
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