Pleiades

https://pleiades.stoa.org/

Geography aficionados and readers who appreciate the ancient world may want to check out Pleiades, a resource billing itself as "a community-built gazetteer and graph of ancient places" that "gives scholars, students, and enthusiasts worldwide the ability to use, create, and share historical geographic information about the ancient world in digital form." Visitors may like to begin by exploring this project's more than 36,000 places, a random selection of which appear in the slideshow on the main page. Rather than traditional GIS layers, this intriguing project organizes its data into conceptual places, spatial locations, and identifying names, all of which are connected together to create reference information hubs. Those interested in downloading data or contributing to Pleiades should be sure to visit its Blog and Help sections. As of this write-up, the site has "extensive coverage for the Greek and Roman world, and is expanding into Ancient Near Eastern, Byzantine, Celtic, and Early Medieval geography." Pleiades was created as a joint project of the University of North Carolina's Ancient World Mapping Center, the Stoa Consortium, and New York University's Institute for the Study of the Ancient World. 

via https://scout.wisc.edu/archives/r51294/pleiades