Orakei Basin
Encyclopedia
Orakei Basin is one of the volcanoes in the Auckland Volcanic Field
. It has an explosion crater around 700 m wide, with a surrounding tuff ring. After eruption about 85,000 yrs ago, it became a freshwater lake that had an overflow stream in the vicinity of present Orakei Rd bridge. As sea level rose after the end of the Last Ice Age, the lake, which by then had shallowed to a swamp, was breached by the sea and has been a tidal lagoon ever since. A tidal lagoon, it is popular for watersports. A railway line (the North Island Main Trunk, branded as the Eastern Line
for suburban services) runs through the north side of the basin.
Auckland Volcanic Field
The Auckland volcanic field is a monogenetic volcanic field in the North Island of New Zealand. Basaltic in nature, it underlies much of the metropolitan area of Auckland....
. It has an explosion crater around 700 m wide, with a surrounding tuff ring. After eruption about 85,000 yrs ago, it became a freshwater lake that had an overflow stream in the vicinity of present Orakei Rd bridge. As sea level rose after the end of the Last Ice Age, the lake, which by then had shallowed to a swamp, was breached by the sea and has been a tidal lagoon ever since. A tidal lagoon, it is popular for watersports. A railway line (the North Island Main Trunk, branded as the Eastern Line
Eastern Line, Auckland
The Eastern Line in Auckland, New Zealand is the name given to Auckland suburban part of the North Island Main Trunk. Suburban services are operated by Veolia under the MAXX brand...
for suburban services) runs through the north side of the basin.