Hike 7 km through sharply eroded white ridges to a dramatic cutting edge above Lake Punta Negra and Ullum Reservoir. This guided, moderate trek combines vivid geology, wide valley views, and a 45-minute 4x4 approach from Ciudad de San Juan.
More ways to explore the area's outdoor wonders
The wind off the Precordillera meets you first, brisk and insistent as the 4x4 drops the group at Punta Negra Dyke. Under a wide sky, a trail peels away from scrub and tight pine stands into a landscape of white, highly eroded ridges that cut the slope like geological handwriting. Step by step you gain a ridge where the valley opens: Lake Punta Negra glints below, the Ullum reservoir sits like a dark mirror, and the Zonda Valley stretches toward the dry spine of Sierra del Tontal.
Difficulty
moderate
Duration
5 hours
Fitness Level
Suitable for hikers with average fitness who can sustain steady uphill walking and manage short steep sections.
Wildlife
History
The Precordillera records ancient uplift and sedimentation; local ranching routes and water management around Ullum shaped settlement patterns in San Juan province.
Conservation
Stay on established trails to protect fragile erosional formations and sparse native vegetation; water is scarce—pack out waste and minimize consumption.
Reserve your spot on the Panoramic Trekking to the Black Edge today and enjoy a trusted, highly rated experience designed to help you make the most of your adventure.
Start early for light and wind
Departures between 7:00–8:00 optimize soft morning light and calmer winds on exposed ridgelines.
Bring at least 1.5–2 L of water
Hydration is essential in the dry Precordillera—carry more than you think for a 5-hour outing.
Sturdy footwear required
Expect uneven, rocky terrain and loose scree on erosional ridges—ankle-supporting hiking boots reduce risk.
Watch for rapid weather shifts
The guide may cancel for poor weather; cold gusts and sudden storms can occur in shoulder seasons.
Hiking boots
Provide traction and ankle support on loose, eroded slopes.
Sun hat and SPF 30+ sunscreen
Protects against strong high-altitude sun on exposed ridgelines.
summer
Insulating mid-layer
Keeps you warm during cool mornings and windy summits.
spring
Daypack with 2L water system
Carries water, snacks, and layers for a half-day trek.