It's an islet not an island, which under UNCLOS is a really important distinction. Islands get an EEZ around them, islets don't. Rockall gets 12 nautical miles

It's an islet not an island, which under UNCLOS is a really important distinction. Islands get an EEZ around them, islets don't. Rockall gets 12 nautical miles of territorial waters around it, but no EEZ. The distinction between islets and islands is the basis of what China is up to with the artificial islands it is constructing. UNCLOS is a really interesting thing to get stuck into if you are a legally inclined geek.