# Cradock Channel

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The **Cradock Channel** is one of three channels connecting the [Hauraki Gulf](/source/Hauraki_Gulf) with the Pacific Ocean to the northeast of [Auckland](/source/Auckland), New Zealand.[1] It is the central channel, lying between [Great Barrier Island](/source/Great_Barrier_Island) to the east and [Little Barrier Island](/source/Little_Barrier_Island) to the west. The other two channels are the [Jellicoe Channel](/source/Jellicoe_Channel) and the [Colville Channel](/source/Colville_Channel).

Approximately 17,000 years ago during the [Last Glacial Period](/source/Last_Glacial_Period) when sea levels were significantly lower, the area was a part of a vast coastal plain. The area where the Cradock Channel exists was where the [Waitematā Harbour](/source/Waitemat%C4%81_Harbour) (then a river) and the [Mahurangi River](/source/Mahurangi_River) passed before reaching the [Pacific Ocean](/source/Pacific_Ocean).[2]

## References

1. ["Estuary origins"](https://niwa.co.nz/te-kuwaha/tools-and-resources/ng%C4%81-waihotanga-iho-the-estuary-monitoring-toolkit-for-iwi/estuary-origins). [National Institute of Water and Atmospheric Research](/source/National_Institute_of_Water_and_Atmospheric_Research). Retrieved 3 November 2021.

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Adapted from the Wikipedia article [Cradock Channel](https://en.wikipedia.org/wiki/Cradock_Channel) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Cradock_Channel?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.