Nimos is an uninhabited Greek island in the municipality of Symi, in the Dodecanese island group of the southern Aegean Sea. Located off the northern coast of Symi, from which it is separated by a small shallow strait called Diapori, it has an area of 4.6 square kilometres (1.8 sq mi). It is the Ymos island of the ancient Greeks.
The island, like Symi itself and the other surrounding islets, has been proclaimed an archaeological site by Greece's Central Archaeological Council.
The Dodecanese (UK: /ˌdoʊdɪkəˈniːz/, US: /doʊˌdɛkəˈniːz/; Greek: Δωδεκάνησα, Dodekánisa [ðoðeˈkanisa], lit. 'twelve islands') are a group of 15 larger and 150 smaller Greek islands in the southeastern Aegean Sea and Eastern Mediterranean, off the coast of Anatolia, of which 26 are inhabited. This island group generally defines the eastern limit of the Sea of Crete. They belong to the wider Southern Sporades island group.
Rhodes has been the area's dominant island since antiquity. Of the others, Kos and Patmos are historically the most important; the remaining 12 are Agathonisi, Astypalaia, Halki, Kalymnos, Karpathos, Kasos, Leipsoi, Leros, Nisyros, Symi, Tilos, and Megisti. Other islands in the chain include Alimia, Arkoi, Farmakonisi, Gyali, Kinaros, Levitha, Marathos, Nimos, Pserimos, Saria, Strongyli and Syrna.