yes there is one but beware it may charge for withdrawals as it is a Euronet (but not sure). However, there is an Atm on the main road to Skala Potamia which didn't have charges when I last used it (about 30 min walk). There is also another Euronet on the promenade at Skala Potamia and again may charge but not use it to confirm
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I believe there is an ATM by the Campground.