light Elves now a days are mostly peaceful but they weren't always. a long time ago their was a mighty Elven empire being the first to smelt steel while the other races were still using bronze armor and swords either killing or enslaving other races. but due to a combination of all the other races unifying against them, disease, and the collapse of infrastructure led to the empire dissolving with the remaining Elves settling in there strongholds being isolated for over a thousand year. the question i want to know is what locations could Elves create a self sufficient stronghold with early Greek/Athens level technology with an on average population of 500-1200 people?
NOTE: magic does not exist in my story.