Fodor's Expert Review Catedrales de Marmol

The Catedrales de Marmol ("Marble Cathedrals") are impressive rock formations of calcium carbonate formed over 6,200 years on the western shores of Lake General Carrerra. Over time, they have been worn away by the water, creating a maze of caves, tunnels, and huge columns of multicolored pure marble. This popular spot on the tourist trail is possible to reach by boat or kayak. There are small boat tours on offer near the site, which is on the Carretera Austral about 218 km (135 miles) south of Coyhaique near the small town of Puerto Río Tranquilo.