Xunantunich is a spectacular ruin perched atop a hill overlooking the Mopan River and the Cayo District, near the border with Guatemala. Cross the Mopan River west of San Ignacio on a ferry to reach Xunantunich or Maiden of the Rock. The main pyramid known as El Castillo is one of the tallest buildings in Belize rising 130' above the jungle canopy. The reward for climbing to the top with your licensed guide is a spectacular view of the Cayo District and Petén Guatemala.