Nestled between the Mardas, Montagnon and Escala ridges, what sets the Montagnon d'Iseye Lake apart is its heart shape and isolation. It's a long way to go to reach this natural wonder. Highly original trail.
From Oloron, follow signs for Spain-Zaragoza on the N134. Follow Accous after the bypass. Pass the Accous church and turn right at Aulet (leaving the Chapelle Saint Christau). After the green bridge, park at the fork.