Croagh Patrick: Ireland’s holy mountain, a 764-meter peak near Westport, associated with St. Patrick’s 40-day fast. Achill Island: Ireland’s largest island, connected by a bridge from Mulranny, known for its dramatic cliffs and beaches. Visitors can expect guided tours of the working mill, demonstrations of weaving and spinning, and a shop selling woollen goods. Mayo is Ireland’s third largest county by size (5,398 square km) and 18th largest by population (137,970). In terms of hospitality, Mayo is Ireland’s tenth most visited tourist county with around 218,000 international visitors per year.