Laguna 69 is so named as a pair of "gringos" were found engaging in the namesake act of passion - I'm just kidding, it probably refers to the distance the lake is from the nearest village, Yungay in kilometers. At 4,600m above sea level, the hike to the lake is on the whole not that demanding and could be done as a day trip without much troubles. The glacial melts that feed this aquamarine lake is from the mountain, Chacraraju (6.112m) behind it.