National Marine Heritage Record (NMHR) of England

The NMHR relates to heritage assets that lie between Mean High Water and the 200 nautical mile sea limit, as well as the tidal extent (at Mean High Water spring tides) of rivers, estuaries and creeks – i.e. the operational extent in England of the Marine Management Organisation’s (MMO) inshore and offshore remits as laid out under the terms of the 2009 Marine and Coastal Access Act.