Lake Ouler - Ireland

Lake Ouler is located in Wicklow Mountains National Park and it’s definitely a sight to see. That is, as long as you can hike the challenging 33rd highest mountain in Ireland. The lake’s creation dates back to the Ice Age, when it was formed by glaciers and now sits on the side of the Tonelagee Mountain. Tonelagee stands at an altitude of 2,680 feet.