– Region: Puebla — Sierra Negra (4,580m, adjacent to Pico de Orizaba — Large Millimeter Telescope site)

 – Elevation: 4000

 – GPS Coordinates: 18.984° N, 97.316° W

 – Access Difficulty: T2 — Rough road from Ciudad Serdán or Atzitzintla (3–4hr hike from end of road) 

 – Opening Season: Oct–Mar (dry season)

 – Winter Room: – Number of Beds: 0  – Showers: No

 – Drinking Water: No — BYO water – Meals & food: No — BYO stove

– Mobile Signal: No – Payment Methods: Free camping | summit area restricted (observatory) | accessed from Ciudad Serdan-Puebla

 – Reservation Link: Click here to make a reservation

 – Short Description: Sierra Negra (4,580m) — 5th highest in Mexico, often overlooked as it stands adjacent to Orizaba. Houses the Gran Telescopio Milimétrico (GTM) — one of the world’s largest millimeter-wave telescopes. Road reaches near summit. Good acclimatization peak; views of Orizaba’s southern slopes, Popocatépetl, Izta, Malinche simultaneously.