Twelve new marine conservation zones have been designated in the seas around Devon and Cornwall.
The UK government has announced new safeguards from the Dart estuary to the Isles of Scilly.
More than 6,000 sq km in the South West will now be part of the UK's blue belt - that's an area twice the size of Cornwall.
Species and habitats that will benefit include fan mussels and the deep sea bed.
Quote Message: This is a tremendous moment for our internationally famous coast and surrounding seas. Until now, far too much of it has been unprotected. The challenge now is to manage these sites properly, stop damaging activities like scallop dredging and monitor their condition so that we can be sure to leave future generations with something at least as good as we have today. from Harry Barton Chief Executive of Devon Wildlife Trust