El Leoncito National Park, National park in Calingasta Department, Argentina
El Leoncito is a national park in San Juan Province covering the western slopes of Sierra del Tontal, with desert plains, mountain ridges, and high-altitude oasis valleys. The landscape shifts from dry expanses to soaring peaks, creating a rugged terrain that varies widely across the reserve.
The area became a nature reserve in 1994 and gained national park status in 2002 when San Juan Province transferred it to federal control under Law 25656. This two-step process reflected growing efforts to protect the region.
Telegraph posts scattered across the park are remnants of a line that once connected San Juan to Calingasta until the early 1900s. They stand as traces of how people tried to link these remote areas through technology.
Entry to the park is free and basic camping facilities include grills, tables, restrooms, and hot showers for visitors. The main access point sits about 34 kilometers from the town of Barreal, making it relatively easy to reach.
The park enjoys exceptionally clear skies with over 300 clear nights each year, making it highly suited for astronomical observation. Two major observatories operate here and use these ideal conditions for international research and sky studies.
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