While building the places.xml file I decided to get a list of all places without coordinates (either because we don't know or because they're fictional). This is the list (with a few comments):
Asopus (name of five different rivers in Greece and Turkey and also in Greek mythology the name of the gods of those rivers)
Ephrya (aka Kichyro? probably here: 39.23620 20.53443)
Ismarus
Land of the Bebryces (Bythnia? 40.59 30.80)
Lydia (38.88/27.94ish)
Lyrnessus (somewhere in Dardania? 39.98 26.48)
Media
Mimas (aka Karaburun? 38.6334/26.5167)
Mount Caphareus (somewhere on Euboea?)
Tartessa (somewhere here? 37.237 -6.232)
Thasus (aka Thasos? 40.7789 24.7107)

Adrastia (aka Adrasteia (Mysia)? 40.22 28.44)
Aeaean Ilse
Aegialia (is this a person or a place?)
Aegialus (is this a person or a place?)
Aeolia (is this Aeolis or Thessaly?)
Aipy (modern Makistos? 37.5319 21.7308)
Among the Gerenians
Amphigenea
Amphilochian Argos
Anemorea
Araethyrea (Phleius? 37.839 22.639)
Arene
Arges
Atlas
Atthis
Augeae
Bessa
Celtic Nation
Cenaeum
Cinyps
Colone
Crenidian Gate
Cybela
Cyparisseis
Dardania
Dirce
Doliones
Echedorus
Eionae
Electran Gate
Eleon
Enchelea
Endium
Erectheis
Erythia
Eteonos
Europe
Fairyland
Gates of Acheron
Gonoessa
Grove of the Mycenaeans
Hades
Heaven
Homoloidian Gate
Hypoplacian Thebes
Hypsistan Gate
Linaeum
Mount Abas
Mount Dicte
Mount Parthenius
Mount Phicium
Navaethus
Nisa
Ocaleae
Oetylus
Ogygia
Ogygian Gate
Oncaidian Gate
Oresteum
Pelasgians
Pelasgiotis
Phlace
Phrygia
Precinct of Hera
Precinct of Poseidon
Proetidian Gate
Pteleum
River Anaurus
River Tigres
Samethere
Scaean gate
Sea
Sky
Smithy of Hephaestus
Styx
Tartarus
Tenos
the Elysian Fields
the Islands of the Blest
the islands of the Taphians
the Isle of the Sirens
the land of the Cyclopes
the land of the Laestrygones
the land of the Lotus-eaters
the land of the Phaeacians
the land of the Taurians
The land of the Thesprotians
the Nine Roads
Thryum
White Isle