Walk Distance Athens to Stobreč is 20-30 days. They couldn't walk? They had borders lines and they couldn't dare pass them? Yes Greeks just appear from nowhere

Walk Distance Athens to Stobreč is 20-30 days. They couldn't walk? They had borders lines and they couldn't dare pass them? Yes Greeks just appear from nowhere 3k years before with a full a develop language better than this thing i am writing, math , medicine etc..