Camuy River Underground Access Road
Underground river system through limestone karst caves
The Camuy River Underground Access Road drops you into Puerto Rico’s largest cave system, where the Camuy River carved a 10.2-mile network through Oligocene limestone over millions of years. This technical route starts near Lares and winds through dense karst topography to reach underground river access points and hidden cenotes that most tourists never see. The road crosses the Camuy River seven times before reaching the massive Clara de Empalme cave chamber, where you’ll need to wade through knee-deep water with your gear.
This is expert-level terrain demanding high-clearance 4WD with skid plates and recovery gear. The limestone bedrock tears up tires, and flash floods can trap you underground during rainy season (May through November). Dry season offers the safest passage, but even then you’re looking at multiple water crossings and steep limestone ledges. Bring spelunking gear, waterproof bags, and plenty of fresh water — the underground segments offer no cell service and temperatures drop 15 degrees underground.
Trail Specs
| Difficulty | Expert |
|---|---|
| Trail Type | Technical 4x4 |
| Surface | Rock |
| Features | Historic, Remote, Water Crossings |
| Length (miles) | 12 mi / 19.3 km |
| Duration | 2 days |
| Max elevation (ft) | 1200 ft |
| Best season | December-April |
| Minimum vehicle | Modified 4WD with skid plates |
| Nearest town | Lares, Puerto Rico |
| Land manager | Puerto Rico Department of Natural Resources |
| Permit required | Yes |
| Cell service | None |
| Water crossings | Yes |
| Dispersed camping | No |
| Start coordinates | |
| End coordinates | |
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| Find on Google | Search on Google → |
Location
Trail Conditions
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Frequently asked questions
Will a stock Jeep Wrangler or 4Runner handle this trail?
No. Stock rigs will get torn up on the sharp limestone karst. You need a modified 4WD with skid plates, a lift, and ideally rock sliders — the jagged surface will shred unprotected underbodies fast.
Is the trail accessible year-round or does the wet season shut it down?
Stick to December through April. Puerto Rico's wet season (May–November) raises the Camuy River significantly, making the water crossings dangerous or impassable and turning the cave sections into flood hazards.
Do you need a permit to run this trail?
Yes. A permit is required through the Puerto Rico Department of Natural Resources. Contact them directly before your trip — this isn't a trail you want to show up at without paperwork and risk getting turned back or fined.
What's the hardest section and what should I actually expect?
The underground chamber crossings are the crux — you're navigating sharp limestone shelves in low light with live water crossings in tight quarters. There's no margin for error; a stuck rig inside a cave system is a serious recovery situation with no easy winch anchor points.
There's no cell service — how do I handle emergencies or navigation on a 2-day route this remote?
Download offline topo maps before you leave and carry a satellite communicator (Garmin inReach or SPOT). Nearest emergency services are out of Lares, so self-rescue capability is mandatory — don't run this one solo.
Trail track
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