Starting from the point with coordinates N 288 050 E 591 800 (Landmark of 911m, located on the Costa Rica - Panama border line). From there, a straight line is followed to the point with coordinates N 287 950 E 591 700. Then continue with a straight line to the point with coordinates N 287 940 E 591 525. This point intersects the waters of the main spring (naciente principal) of the Callejonuda stream, therefore the reserve boundary follows downstream along this stream to its confluence with the Coloradito River, at coordinates N 283 625 E 587 775. From there, proceed upstream along the Coloradito River to the point with coordinates N 283 085 E 588 500, the point where the Brujo stream empties into the Coloradito River. Continue upstream along the Brujo stream to the point with coordinates N 283 265 E 589 000. From there, a straight line to the point with coordinates N 283 150 E 589 250. A small stream drawn on the map by contour lines is intersected there, and continue along this stream upstream to the point with coordinates N 282 900 E 589 580. From there, a straight line to the point with coordinates N 283 075 E 590 175. From this last point, the reserve boundary passes through the following coordinate points that cross the summit of Fila de Cal: N 283 550 E 590 605, N 283 650 E 590 750, N 283 650 E 590 930, N 283 800 E 591 125. This last point intersects one of the springs (nacientes) of the Brujo stream, the boundary continuing upstream along this spring drawn on the map by contour lines to the point with coordinates N 283 550 E 591 830. This last point is located on the Costa Rica - Panama border line. From there, the reserve boundary takes a northeast direction, following the Costa Rica - Panama border line to the point with coordinates N 284 000 E 592 250. A point where the direction changes, continuing northwest, always following the border line, to the point with coordinates N 288 050 E 591 800, the point of origin of this description.
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