Why are some Foreshores and Estuary’s marked in Pink

Apologies but I am new member and can’t find a map key and was wondering why are some foreshores and estuary’s are hi-lighted in Pink?

Many thanks - Frank

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The layer info can be found here : Ground Overlays

Click on the area and it will tell you what it is. The pink are the “ Crown Estate Foreshore and Estuary”.