Issyk-Kul is a faintly salt sea held 1,600 metres up in the Tian Shan of eastern Kyrgyzstan, and it does not freeze. The depth is the heating system. Six hundred and sixty-eight metres of mildly salty water, with hot springs running in, hold enough warmth to see off a Tian Shan winter. The surface stays open all year, and the country's biggest ski base runs above it at three thousand metres. The Kyrgyz named it for that: Ysyk-Köl, the warm lake. On the north shore at Cholpon-Ata the shallows climb to twenty-two degrees in July and August, and old wooden piers run out among poplars over water clear enough to see the bottom from the planks under your feet. The salt is faint, but there is enough of it to hold you a little higher than fresh water would. The south shore is the empty one: wide golden beaches backed with rosehip, mountains coming almost to the waterline, and long stretches where you hear nothing but the lake. Before the wind gets up, the water lies flat and the snow peaks stand upside down across it.
Inland from the south shore the blood-red sandstone wall of Jeti-Ögüz, the Seven Bulls, stands over a valley of yurts and horses, with trails climbing from it toward the snowfields. On the edge of Cholpon-Ata you walk among thousands of carvings on dark boulders — ibex, snow leopards, hunting scenes — cut between the Bronze Age and the Middle Ages. They sit where their makers could watch the lake and the peaks behind it. Caravans on the Silk Road watered here, and the lake kept more of that traffic than anyone knew. In 2025 divers mapping the shallows off the north shore traced the streets of a town an earthquake had dropped into the water. It had stood from about the tenth century to the fifteenth. Fired-brick buildings, a grain mill with its millstone, a graveyard: all of it lying in one to four metres of water.