The Classical Atlas Project is a very large mapping project with a printed atlas to be published in autumn 2000.
The Interactive Ancient Mediterranean is low resolution download version of the above.
The Perseus Project features an interactive atlas of the ancient world.
Atlas historique de l'Antiquité tardive is an interactive atlas of late antiquity.
The Journal of Roman Archeology features articles about classical geography.
Roman Military Sites in Britain has some information on the Roman army.
OSSHE Atlas Resources is an atlas image library.
The Edinburgh GIS Server is a good index to GIS resources.
The GTOPO30 is the topographical database used for Orbis Romanus.
The Ancient World Web is a web index to classical resources.
The ROMARCH index is another large index to classical resources.
Roman Sites is another large index containing also the Lacus Curtius edition of Ptolemy’s Geography.
The Latein-Forum is a german site on all Latin related subjects.