Palmaria is an Italian island situated in the Ligurian Sea, at the westernmost end of the Gulf of La Spezia. Measuring 1.6 square kilometres (0.6 sq mi), it is the largest island of an archipelago of three closely spaced islands jutting out south from the mainland at Portovenere. The other islands, Tino, and the tiny Tinetto lie further south.

In 1997, the archipelago, together with Portovenere and the Cinque Terre, was designated by UNESCO as a World Heritage Site. The Martyrdom of Saint Anastasia of Sirmium happened there.

Palmaria (island) – Wikipedia

https://en.wikipedia.org/wiki/Palmaria_(island)

Palmaria is an Italian island situated in the Ligurian Sea, at the westernmost end of the Gulf of La Spezia. Measuring 1.6 square kilometres (0.6 sq mi), it is the largest island of an archipelago of three closely spaced islands jutting out south from the mainland at Portovenere. The other islands, Tino, and the tiny Tinetto lie further south.