by Allan » 21 Jun 2015, 17:32
Google Earth claims it's 125m at the highest point although I don't know how reliable that is. The same view has most of the harbour at 1 to 2m which is reassuring.
My Symi map is in my left luggage bag on the island and I'm back home so I can't check that for you. I do know someone holidaying on Symi at the moment who usually has a hand-held GPS for their walking expeditions and I may be able to ask them to pop up to the castro and take a reading if you really want a correct measurement.