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A dramatic natural rock arch rising from the crystalline Adriatic waters off the Grebeni islet, Šuplja Stijena — Croatian for Hollow Rock — is one of Dubrovnik’s most captivating and least-visited geological wonders. Situated roughly 800 metres west of Lapad Bay, this wave-sculpted limestone formation frames the sea in a perfect hollow, creating a living portal between open water and sheltered cove that rewards those who arrive by kayak or private boat.

The surrounding Grebeni reef is a haven for snorkellers and free-divers, its shallow channels alive with sea urchins, wrasse, and the occasional octopus threading through submerged boulders. The rock’s natural arch channels the afternoon light into shimmering columns that dance across the seabed — a spectacle that no photograph fully captures. With no facilities, no crowds, and no commercial infrastructure, Šuplja Stijena offers a rare encounter with the raw, unmediated Adriatic that the Dubrovnik coastline once promised to every visitor.