The largest national park in El Salvador and the most ecologically important. The name comes from how brutal the terrain was for mule teams in the colonial era — it's still rugged. Over 500 plant species, 285 bird species, 100 mammal species, ocelots, black eagles, and more than 5,000 butterfly species. Quetzals have been spotted here. A guide is mandatory. 4x4 strongly recommended, required in the rainy season. Reservations through SalvaNatura (+503 2279-1515).
Do I need to reserve in advance?
Yes — MARN permit required: cidoc.ambiente.gob.sv
Is a guide mandatory?
Yes, all trails require a certified guide inside the park.
Do I need a 4x4?
Strongly recommended. Mandatory during rainy season (May–October).
What's nearby?
Apaneca (30 min), Ruta de las Flores, and Barra de Santiago (beach + mangroves).