Piedra Numerada is a primitive backcountry campsite set in a green mountain valley along Estero Del Cepo, within the Valle del Cepo near Farellones in the Lo Barnechea area of the Santiago Metropolitan Region.

It sits at high elevation amid the Andes, offering a privileged view of Cerro El Plomo. The site is not a developed or established campground — reaching it requires a moderate trek of roughly 7–9 kilometers depending on the approach taken.

The camping area features a mix of terrain, including a small vega (wetland meadow) and drier, earthen ground better suited for pitching a tent. Natural water sources are available nearby.

The name comes from a numbered rock historically used by arrieros (cattle drovers) to count their animals before descending to lower elevations ahead of winter. A large landmark boulder marks the valley.

The site sees relatively light use due to its remoteness, making it a genuine escape from the city and a common overnight stop for trekkers heading toward Cerro El Plomo or traversing the Cordón del Cepo.