In reply to Lh88:
Hi Luke,
Around the trikala region there is little gorge and mouzaki, both are excellent sport climbing crags. Up in the north, an hour from Thessaloniki is Kavala which offers both sport and trad by the sea. Further north, near Bulgaria is Blue Zinas cave which offers super steep pocket pulling though the easiest/best routes here are 7a+ and above.
Around Athens are a plethora of crags (check out the newly published Athens guide book) with my favourite being Mavrosouvala.
In the Peloponnesus, Lagada and Nedousa both have really good sport climbing and are good for summer climbing due to their altitude.
And there's the new crags at Leonidia which I spent a day at early this year. We went to the twin caves sector and it was amazing - super steep tufa pulling! I am heading back there at Christmas/year to check out the other crags in the area. It has been plugged as the next Kalymnos, though the only problem are the aspects of the crags there meaning that its too hot after March to climb there. That is worth bearing in mind with a lot of crags in Greece.
And then the islands.....other than Kalymnos, I know Crete has some sport though haven't tried it and some boulders have just been opened on Ikeria. Hoping to check them out next year. There is also bouldering in Tinos which has lots of potential but never seemed to take off.
For info, try climbing-Greece website and there is also one for Leonidia. If you need any more help/local topos, let me know!