Hauraki Gulf Marine Park

The original outer boundary was edited to align with the current (March 2012) Territorial Sea Outer Limit feature from LINZ and the Regional Councils (2011) (for northern and southern boundaries). The outer boundary was merged with the MHWS line. The MHWS line provides a practical measure of the natural land – sea boundary. This line was developed by taking output from tidal exceedence curves from across the region and projecting the heights of MHWS10 onto the regional LiDAR dataset in order to provide an indication of the MHWS10 position in a consistent manner along the entire coastline. Note the MHWS10 line takes into account local and regional variability of tide levels based on best available information, including differences between east and west coasts on a regional scale, and estuaries to open coasts on a local scale. Minor manual corrections have been made to the modelled MHWS10 line to improve its representation on aerial photography in some places along the coast. The line for the Auckland Region was appended with the line provided by the Waikato Regional Council to form a combined Auckland - Waikato coastline for the purposes of the Marine Spatial Plan. Updated by DOC in 2023. See the Hauraki Gulf Marine Park Act 2000: https://www.legislation.govt.nz/act/public/2000/0001/latest/DLM53404.html