Callac is located 28 kilometers southwest of Guingamp and 20 kilometers northeast of Carhaix-Plouguer, Finistère. It is watered by the small Hyères river, a tributary of the Aulne. The site of on the Hyères.
Callac is also a Green Station. It is a leisure and vacation tourist destination, recognized nationally as an organized resort, offering the services and pleasures expected in the Nature universe. Nature respected and preserved, a Tourist Information Office organizing reception and information, places and activities to experience and share: nature, visits, leisure facilities, a gateway to the terroirs (products to taste) and finally, services, shops, play areas.