Old Harry Rocks are the chalk stacks at the end of the headland beyond Studland, and they mark where the Jurassic Coast World Heritage Site begins.
Walking there
From Studland village it is roughly a mile and a half each way on the coast path, mostly level with a gentle climb onto the headland. Take the chain ferry from Sandbanks to get there in four minutes.
By boat
Coastal trips from Poole Quay run out past them. From the water they are a different proposition entirely. See boat tours.
Exposed headland: take a windproof layer whatever the forecast said in town.