Lough Ouler – Wicklow's Famous Heart-Shaped Lake

High on the slopes of Tonelagee Mountain lies one of the most unique natural landmarks in Ireland — Lough Ouler, often called Wicklow's Heart-Shaped Lake. Hidden from the road and visible only from the surrounding hills, this glacial lake has become one of the most photographed locations in the Wicklow Mountains.

Formed thousands of years ago during the last Ice Age, Lough Ouler sits in a deep corrie carved out by retreating glaciers. The result is a lake with an almost perfect heart outline, which appears most clearly when viewed from the top of Tonelagee or its neighbouring ridges. On a bright day, the shape is striking — a dark blue heart surrounded by green slopes and sweeping mountain views.

The hike to the lake's viewpoint is one of the most rewarding in the Wicklow uplands, but it is also exposed, boggy in sections, and requires careful navigation in mist. For those willing to make the climb, the reward is unforgettable: panoramic views over the upper Wicklow Mountains and the iconic heart shape nestled in the valley below.

Whether you're visiting Wicklow for the first time or exploring new routes, Lough Ouler offers one of the most dramatic and romantic landscapes in the region. It's become a favourite spot for photographers, couples, and hikers looking for something truly memorable.

For private guided hikes to Lough Ouler or Tonelagee, I tailor routes to your pace and fitness level, ensuring a safe, enjoyable experience on one of Wicklow's most spectacular mountains.