Trifinio Fraternidad Transboundary Biosphere Reserve
The Trifinio Fraternidad Transboundary Biosphere Reserve is a transboundary protected area located where the borders of El Salvador, Guatemala and Honduras meet (thus the prefix tri in its name). It protects the Montecristo massif and its cloud forests across the three countries' borders.
Source: Wikipedia — Trifinio Fraternidad Transboundary Biosphere Reserve (CC BY-SA 4.0)