The Ak-Suu Traverse: Kyrgyzstan's Best Trek (2026)

The Ak-Suu Traverse is a four-to-five-day high route above Karakol that links the Karakol valley, the glacial Ala-Köl (Ala-Kul) lake, a pass of roughly 3,860–3,900 m, the Keldike valley and the Altyn-Arashan hot springs, usually with the red sandstone of Jeti-Ögüz at one end. It is regularly called Kyrgyzstan's best multi-day trek, and the claim holds up: you cross a proper alpine pass, sleep beside a lake that changes colour by the hour, and finish soaking in a thermal spring under a 5,000 m peak. It is also genuinely hard, and the pass sits high enough to make altitude the thing most people underestimate.

This guide gives you the route day by day, how to reach the trailhead from Karakol, the honest difference between going guided and self-guided, and a clear-eyed word on the altitude. Prices are quoted in som and US dollars at roughly 87 KGS to the dollar; confirm the exact figure on the day, because trail-town rates have moved sharply upward since 2023.

At a glance

Duration	4–5 days (a 3-day core is possible; see below)
Distance	~60–75 km for the full traverse; ~45–55 km for the Ala-Köl core
Max altitude	Ala-Kol pass, ~3,860–3,900 m (sources differ; never plan for less)
Elevation gain	~2,400–3,000 m cumulative over the full traverse; confirm with your line
Difficulty	Hard. Not a beginner walk, despite its popularity
Best months	Mid-June to mid-September; the pass is reliably snow-free mid-July to mid-September
Permit	None needed; Karakol National Park entry is 250 som + 100 som per tent
Guided or self-guided	Both work. The main line is well-trodden but poorly waymarked in cloud

The route, day by day

The "Ak-Suu" name comes from the exit: Ak-Suu ("white water") is both the river and the village (Soviet-era Teploklyuchenka, "warm springs") at the mouth of the Arashan valley, about 12–15 km from Karakol town. The full traverse starts west at Jeti-Ögüz, crosses into the Karakol valley over a high pass, climbs to Ala-Köl, drops over the Ala-Kol pass into the Keldike valley, reaches Altyn-Arashan, and walks out down the Arashan valley to Ak-Suu. Most operators sell it as five days; fit, acclimatised trekkers compress it into four.

Here is the five-day shape, with the Ala-Köl core measured on GPS by trekkers who have walked it:

Day	Section	Distance	Gain	Grade
1	Jeti-Ögüz valley → upper-valley camp	~12–16 km	+600–800 m	Easy–moderate
2	Over the connecting pass (~3,800 m) → Karakol valley	~14–18 km	+900–1,100 m	Hard
3	Karakol valley → Ala-Köl lake camp	~12 km	+600 m	Moderate–hard
4	Ala-Köl → Ala-Kol pass → Altyn-Arashan	~16–18 km	+700 m, then long descent	Hard
5	Altyn-Arashan → Ak-Suu (Teploklyuchenka)	~16–19 km	+180 m	Easy but long

Day 1 — Jeti-Ögüz. Start at the Broken Heart rock and the Seven Bulls cliffs, the red sandstone formations that make Jeti-Ögüz worth a stop in their own right (there is a fuller Jeti-Ögüz guide if you want to build in an extra day). Walk up the green Jeti-Ögüz valley through spruce and summer pasture and camp high. It is a deliberately gentle first day that doubles as acclimatisation.

Day 2 — the connecting pass. The traverse crosses from the Jeti-Ögüz drainage into the Karakol valley over a pass of roughly 3,800 m; operators route it via the Archa-Tor or Telety line, so confirm the exact col and its height when you book. This is a big day with over a thousand metres of climbing and your first real taste of altitude. You drop into the Karakol valley near the Sirota camp.

Day 3 — up to the lake. From the Karakol valley you climb steeply to Ala-Köl itself, sitting in a cirque at about 3,530–3,560 m. The colour is glacial rock flour in suspension: milky pale blue under cloud, intense turquoise-teal in direct sun, near-black at dusk. Camping at the lake is the sleep-high option and the best light for photography, but it is exposed and below freezing at night in any month.

Day 4 — the pass and the scree. The crux. You climb from the lake to the Ala-Kol pass at ~3,860–3,900 m, the trek's high point, then face the descent people underestimate: 600–700 m of loose scree and broken rock dropping east into the Keldike valley. Take the gravel "sliding" path rather than the steeper direct line, keep your poles out, and never descend directly above another party — rockfall onto the people below is the real hazard. The valley eases and delivers you to Altyn-Arashan, where a hot bath is waiting.

Day 5 — walk out to Ak-Suu. Altyn-Arashan ("golden spa") sits at roughly 2,400–2,600 m in the Arashan reserve. Soak in the springs, then follow the rough jeep track and the Arashan river down the valley to Ak-Suu, past spruce walls and, near the bottom, apple and apricot orchards and beehives. It is long and downhill on a rocky road; from Ak-Suu a marshrutka or taxi runs you back into Karakol.

The 3-day core. If Jeti-Ögüz doesn't fit your time, skip days 1–2 and start in the Karakol valley: park gate to Sirota (14 km, +905 m), then the big pass day Sirota → lake → pass → Altyn-Arashan (18 km, +1,125 m), then out to Ak-Suu (19 km, +182 m). This is what most Karakol agencies sell as the Ala-Köl trek, and it stands on its own. Adding Jeti-Ögüz turns a very good trek into the fuller traverse.

Getting to the trailhead from Karakol

Karakol (~1,700–1,770 m) is the base for everything here, and the last place with ATMs, gas canisters and a proper bazaar. Bring all your trek cash from town; there are no cards at the park gate, the yurts or the guesthouses.

For the Karakol-valley start, marshrutka 101 (about 10 som) runs towards the national park gate, and a shared 4x4 up to the Sirota bridge to cut the flat approach costs roughly 800–1,000 som per car. For a Jeti-Ögüz start you take a marshrutka or taxi south-west to Jeti-Ögüz village first. At the finish, marshrutka 350 (about 25 som) links Ak-Suu / Teploklyuchenka back to Karakol, or a taxi is around 1,000 som per car. The upper Arashan track itself is brutal — an ex-Soviet UAZ job, not something an ordinary car can drive. Karakol has plenty else to do on either side of the walk, from the wooden Dungan mosque to the Sunday livestock bazaar; see the Karakol guide and the wider getting-around notes for logistics.

Guided or self-guided?

Both are normal on this route. The main line is a well-trodden boot path with occasional cairns, and in clear weather it is easy to follow. The problem is that Kyrgyz trail marking is thin to non-existent, and the two places it matters most — the moraine above the lake and the pass itself — are exactly where cloud rolls in from late morning. In poor visibility, navigation stops being trivial.

Self-guided works if you are comfortable with a map and a GPS track. Download the route as GPX before you go, and carry it offline in Maps.me or Organic Maps (both OSM-based, and Ala-Köl, Altyn-Arashan and the Jyrgalan loops are all drawn on them). 2GIS is the best offline app for the towns and transport. If you want paper, the Austrian Alpine Club (Alpenverein) prints the best 1:100,000 sheets for the Terskey/Karakol area. Do not rely on phone signal — there is none in the upper valleys or at the lake.

Going guided buys you navigation in bad weather, a pack horse for the heavy loads, meals cooked for you, and someone who knows whether the pass is holding snow this week. Book through Destination Karakol, the local DMO, or a Karakol-based operator rather than a Bishkek agency if you want the money to stay in the valley. Either way, this is a serious mountain route; read the trekking-in-Kyrgyzstan overview before you commit.

Rough costs, all to confirm on the day:

Item	Som	USD
Karakol NP entry + tent	250 + 100/tent	~$3–4
Sirota yurt bed	1,000–2,500	~$11–29
Altyn-Arashan guesthouse, half board	~2,100	~$24
Self-supported 3-day trek (own food)	—	~$50–80
Guided group place	—	~$150–250
Private guide, whole trek	—	~$200–350

Altitude: the pass is nearly 3,900 m

This is the part to take seriously. The Ala-Kol pass sits at roughly 3,860–3,900 m, and the standard itinerary builds in almost no acclimatisation: people arrive in Karakol from Bishkek (800 m), start walking, and are on the pass within a day or two. Altitude illness is the commonest reason trekkers bail here, and it is the trek where Kyrgyzstan's cases concentrate.

The rule that matters is sleeping altitude. Above 3,000 m, try not to raise where you sleep by more than about 500 m a day, which is one argument for the five-day traverse over a rushed three: the extra nights and the gentle Jeti-Ögüz start give your body more time. Spend two nights in Karakol before you begin, and never schedule the pass for the day after a Bishkek bus. A headache and a poor night's sleep at the lake camp are common and usually pass; confusion, loss of coordination, or breathlessness at rest mean descend now, not in the morning. Fitness offers no protection. Read the dedicated altitude-sickness guide before you go, and buy insurance that explicitly covers trekking to 3,900 m and helicopter evacuation, because there is no free, guaranteed mountain rescue and no phone signal to call for one. A satellite messenger is genuinely useful up here.

When to go

The broad window is mid-June to end September. The pass specifically is reliably snow-free only from about mid-July to mid-September; snow lingers into late July in a heavy year and can fall fresh on the pass in any month, including August. July and August are the most stable and have every service open; September is quieter and colder with better light, but some yurt camps start packing down by mid-month. Outside that window the route is mountaineering-grade, not a trek. The weather rhythm is worth planning around: clear dawns, cloud building from late morning, thunderstorms and graupel from early afternoon. Aim to be over the pass before about 11:00. For the wider seasonal picture, the best-time-to-visit guide is the place to start.

If this route sounds like your kind of walking, browse Karakol-based options on the trekking tours page and match a guided departure to your dates — or use it as the backbone of a longer Terskey Ala-Too trip.