tonak tsho lake, gokyo valley, way to cho oyu base camp

lake gokyo himalaya himalayan himalayas alp alpine area asia asian base camp beautiful beauty blue cho oyu climbing everest glacier hike hiking land landscape man mount mountain mountains nature nepal nepali outdoor peak rock sagarmatha scape scenery sierra sky stone thonak tibet tibetan top travel trek trekking tsho tso upland valley water tonak view three passes trail