The R566 travels southwest from the N70 (Ring of Kerry) to Ballinskelligs. At Ballinskelligs, the road becomes the Skellig Ring, travelling northwest via the coast. Along this coast, high-cliffed Puffin Island, an important seabird reserve,[4] lies just offshore. The road terminates at the R565 at Portmagee, where Valentia Island may be reached by bridge. The R566 is 25.5 km (15.8 mi) long.[1]