Lokrum or Lacroma is one of the islands around the city of Dubrovnik about 700 metres  from the coast stretching from the northwest to the southeast, in the Adriatic sea, Croatia. Its highest point above the sea level is at 91 m.The Austrian archduke (and short-lived Emperor of Mexico) Maximilian once had a holiday home on the island. A monastery and a botanical garden date from his era. On this peak stands Port Royal Castle, which was built by the French, though it was later named "Maximilian's Tower" by the Austrians. On the eastern side of the island, protected from the open sea, there is a small natural harbour. The island covers an area of 0.8 km and is covered in thick Mediterranean flora and woods: laurel, oak, pines, cypress and black pines. There are also olives, agaves, cacti,magnolia and palms. On the southern part of the island there is a small salt lake, 10 m deep, known as "the Dead Sea" (Mrtvo More). Nearby there is a deserted Benedictine monastery, founded in 1023. The triple-naved basilica, and a 14th century part of the monastery were badly damaged in the 1667 earthquake. The monastery was deserted in 1798. Today Lokrum  is a Nature Reserve and a Special Forest Vegetation Reserve. The island is now a popular destination with visitors to Dubrovnik. A restaurant is located in the former monastery, and walking routes round the island are marked out. There is also a nudist beach at the south-eastern end of the island.