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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.
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.
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.
Verified experiences and guided adventures in the surrounding area.
Operated by Posta Inca Adventures Expeditions · San Juan, San Juan
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.
This route threads natural history and local culture. The Precordillera records uplift and erosion—soft sedimentary layers exposed and carved by wind and occasional flash floods—while nearby ranching communities have long harvested scarce water and built terraces and tracks still used by guides today. Cerro de La Sal and the aligned dyke formations tell a volcanic and sediment story visible in the banded stones underfoot.
Expect a steady, moderately steep grind: roughly 7 km round-trip with about 400 m of ascent, led by a certified guide and reached after a 45-minute 4x4 approach from Ciudad de San Juan. Photographic stops at the cutting edge reward early-morning light; the wind dares you to linger on exposed viewpoints.
Practical notes: wear sturdy hiking boots, sun protection, and layers—the valley heats quickly but ridgelines stay cool. Bring 1.5–2 L of water, snacks for energy, and a small daypack. The trail suits hikers with average fitness; if you have spinal or cardiovascular issues, discuss suitability with your provider. Plan for an outing of about five hours including transfers.
moderate.
5 hours.
Suitable for hikers with average fitness who can sustain steady uphill walking and manage short steep sections.
The guided route is about 7 km round-trip with roughly +400 meters of ascent, completed in about five hours including transfers.
Most departures include a 45-minute transfer by 4x4 from Ciudad de San Juan to Punta Negra Dyke; meet times are normally between 7:00 and 8:00.
The trek is moderate and recommended for those with average fitness; it is not advised for travelers with spinal, cardiovascular, or certain pregnancy restrictions—consult the operator before booking.
Bring a camera with a lens for landscapes, extra batteries, sunscreen, sunglasses, a hat, 1.5–2 L of water, and basic first-aid items; the guide carries a first-aid kit and personal accident insurance is included.
The Precordillera records ancient uplift and sedimentation; local ranching routes and water management around Ullum shaped settlement patterns in San Juan province.
Stay on established trails to protect fragile erosional formations and sparse native vegetation; water is scarce—pack out waste and minimize consumption.
Posta Inca Adventures Expeditions operates guided outdoor trips and adventures with an emphasis on safety, stewardship, and memorable experiences.
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.
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.
This route threads natural history and local culture. The Precordillera records uplift and erosion—soft sedimentary layers exposed and carved by wind and occasional flash floods—while nearby ranching communities have long harvested scarce water and built terraces and tracks still used by guides today. Cerro de La Sal and the aligned dyke formations tell a volcanic and sediment story visible in the banded stones underfoot.
Expect a steady, moderately steep grind: roughly 7 km round-trip with about 400 m of ascent, led by a certified guide and reached after a 45-minute 4x4 approach from Ciudad de San Juan. Photographic stops at the cutting edge reward early-morning light; the wind dares you to linger on exposed viewpoints.
Practical notes: wear sturdy hiking boots, sun protection, and layers—the valley heats quickly but ridgelines stay cool. Bring 1.5–2 L of water, snacks for energy, and a small daypack. The trail suits hikers with average fitness; if you have spinal or cardiovascular issues, discuss suitability with your provider. Plan for an outing of about five hours including transfers.