Yreka, California sits about 800 meters above sea level (2600 feet). Is that high enough? According to radicalcartography, half of the people in the world live below 165 meters (541 feet), and only six percent live above 1600 meters. Denver is the Mile High City, that’s about 1600 meters.
Yes—in answer to my earlier question—it is high enough. At least eighty percent of humanity lives at a lower elevation than I do.