A few kilometres off Sandbanks, where the sediment of Poole Bay gives way to low-lying rocky outcrops, lies Poole Rocks Marine Conservation Zone, a protected patch of seabed you'll never see from the beach, but one that matters a great deal underwater. Designated in November 2013, it was among the first 27 Marine Conservation Zones created in English waters, part of a national effort to give fragile marine habitats room to recover from trawling, dredging and other damaging activity.
What's protected here
Unlike much of the surrounding bay, the reef here is rocky rather than sandy, and the water's higher turbidity means the rock is cloaked in "animal turf" sponges, bryozoans and hydroids, rather than seaweed. It's a rewarding habitat for wildlife: the nationally scarce Couch's goby has been recorded here, alongside shoals of pollack and pouting, several wrasse species, and native oysters wedged among the rocks and sediment.
Visiting Poole Rocks
There's no shoreline access, Poole Rocks sits about 2km east of the entrance to Poole Harbour and is reached only by boat. It's a popular site for Seasearch volunteer divers, who survey the reef's marine life for conservation records, and it remains open to recreational boaters and anglers, though bottom-towed fishing gear is restricted to protect the seabed. Anyone planning to dive or fish here should check current byelaws first.
It's one of several protected marine sites dotted along this stretch of the Dorset coast. Explore more of the area in our guide to things to do in Bournemouth.