There are two ways to come by car (Bus) from South Greece and Athens.
The first is: from Chalkida travel to Mantoudi. Just before the entrance of Mantoudi you turn left to Limni. At the next crossroad turn again left towards Limni. Before Limni there is a crossroad towards Rovies. You don't go in Rovies, just continue the main road 3km and you will find Campsite Rovies
The second way is: You go North on National Road E75 and you arrive at Arkitsa. You take the ferry to Edipsos and when you arrive after 40 minutes you drive south to Rovies. It takes 15 minutes to arrive at the campsite.

Both the 2 ways are 2,5 hours long about. The first is fantastic route through the green forests and mountains and through the valley of Kireas River. There aren't any toll posts. The second is restful for the driver but with extra cost (3 toll posts and ferry).

From North Greece the way is to take the ferry from Glifa to Agiokambos and then to go South to Edipsos and then towards Rovies.