Castleisland is a town in Co Kerry. It is renowned for the width of its main street, which is the second widest in Ireland after O'Connell Street in Dublin. Castleisland is often considered the Gateway to Kerry, as the main road to all towns in Western and Southern Kerry passes through here - the N21 from Limerick continues on to Tralee while the N22 goes to Killarney and other towns in Southern Kerry. The Glenaruddery mountains to the north and the Stacks to the west define the beginning of the 'Vale of Tralee', at the mouth of which Castleisland is situated. Most of the land around Castleisland is pasture for dairy stock, with bogland located at various locations around the town, particularly to the east and south. There is a wide range of shops, pubs, restaurants and business premises in the town. Crag Cave, one of the most extensive cave systems in Ireland open to the public, is located just outside Castleisland. The town also has a GAA club, football club, rugby club and athletics club.