Letterfrack is a lively and scenic village in Ireland’s West. It is overlooked by the magnificent Diamond Mountain, lying at the head of beautiful Ballynakill Bay, and by the vast Connemara National Park. The vast National Park of Connemara makes it a haven for both birdwatchers and plant lovers. And geology fans, as well are not left out.. The unusual rock formations of Letterfrack have intrigued geologists for donkey’s years.