Set in the Wicklow Mountains, the Blessington Lakes cover 5000 acres of water. The Lakes were formed 50 years ago by the building of the Poulaphouca Dam and hydroelectric station. The Poulaphouca reservoir is the largest man-made lake in Ireland and is a great base for various outdoor activities. The road around the lake offers amazing views over the reservoir and the Wicklow Mountains. Drive or cycle around the lake going through historic villages such as Valleymount, Ballyknockan or Lacken.