Cerro Castillo's basalt spires are the crowning centerpiece of Reserva Nacional Cerro Castillo a sprawling 1800-sq-km mountain reserve of southern beech forest, 75km south of Coyhaique. The park boasts fine fishing and hiking, along with little foot traffic. Its namesake, the 2700m triple-tier Cerro Castillo, is flanked by three major glaciers on its southern slopes. Hikers can complete a segment of Sendero de Chile with the 16km trail to Campamento Neozelandés.
Another recommended four-day trek (described in Lonely Planet's Trekking in the Patagonian Andes ) leaves from Km75, at the north end of the reserve, and goes to Villa Cerro Castillo at the south end via a high route passing glaciers, rivers and lakes.
