Big Almaty Lake

Big Almaty Lake (locally BAO, from its Russian initials) is a mountain lake at about 2,511 m in the Big Almaty gorge, roughly 15 km in a straight line from the southern edge of Almaty. You cannot drive there: since spring 2026 only people on foot are allowed, and the road walk is about 15 km each way. Swimming is banned because the lake supplies the city with drinking water. The best months are July and August, when the water is at its most turquoise.

What changed at Big Almaty Lake by 2026

Access rules have changed several times in recent years. Here is the timeline from dated sources:

The park gave these reasons: steep slopes, poor visibility, rockfall sections, accidents and injuries involving tourists on rented e-vehicles, and damage to slopes from e-bikes riding off the road. Driving in without permission can lead to an administrative fine.

How to get to Big Almaty Lake

According to AIR Press, you can reach the start of the walk by city bus No. 28 to the Kokshoky stop, or by taxi to the GES-2 junction or the lower national park checkpoint. From there:

Treat this as a proper mountain hike to over 2,500 m, not a stroll. Start early so you are down before dark, and carry water, warm layers and a rain jacket. Electric buses or shuttles have been discussed, but AIR Press reports no decision for autumn 2026.

Why you cannot swim

The lake is a drinking-water source for Almaty, which is why swimming is prohibited. AIR Press adds that fishing and going down to the shore without permission are also banned; you look at the lake from the viewpoints along the road. It is cold in any case: English Wikipedia gives an average water temperature of 8–10 °C, AIR Press 8–12 °C.

Size and colour

Figures are from the English and Russian Wikipedia. Over the year the water shifts from pale green to turquoise blue. Above the lake rise Sovetov Peak (4,317 m), Ozerny Peak (4,110 m) and Turist Peak (3,954 m).

Best time to visit

Seasons as described by AIR Press:

• May–June: the ice melts, snow is still on the slopes;
• July–August: peak turquoise, but thunderstorms and rockfall are possible;
• September–October: fewer people, night frosts, falling water level;
• November–April: road under snow and avalanche risk; experienced hikers only.

How to prepare for the hike

The usual mistake is to think of BAO as a lake on the edge of town. Fifteen kilometres uphill with more than a kilometre of climb is a full mountain day, and the long descent on asphalt is harder on the knees than the way up. Keep in mind:

• timing: with 4–6 hours up and 3–4 down, start in the morning;
• weather: storms and rockfall happen in July and August, so postpone if thunderstorms are forecast;
• altitude: above 2,500 m it is much colder than in the city, and autumn nights freeze;
• food and water: we found no shops or cafés on the route in our sources, so bring everything;
• signal: there is no data on coverage along the route, so download an offline map.

The observatories above the lake

Above the lake stand the Tien Shan Astronomical Observatory and a former high-altitude research station that locals call the Kosmostantsiya. Tengrinews places the observatory about 30 km south of Almaty at roughly 2,735 m. Both are restricted-access sites with no casual visits.

Fees and documents

The approach runs through Ile-Alatau National Park. Its fee under Order No. 232 is 0.15 MCI per pedestrian; the fee calculator converts it to tenge for the current year. AIR Press says you can pay at the checkpoint or via banking apps. Bring ID; children need a birth certificate.

One more detail from Wikipedia: in May 2011, 707.66 hectares including the Almaty gorge and the lake itself were removed from park land and attached to the city of Almaty. The approach is still controlled by the park’s Medeu branch, which is why the park announces the visiting rules. For where border permits are and are not required, see border zone permits.

How it compares with other lakes

Two other famous mountain lakes are often lumped together with BAO. Kaindy Lake in Kolsai Lakes National Park is more than 280 km away and needs an overnight trip, but you can drive a dirt track to its parking area. Lake Issyk, about 40 km east of Almaty according to Wikipedia, was devastated by a mudflow in 1963. BAO is the closest to the city, yet since 2026 it is the one you can only reach on foot.

Nearby

• Nature near Almaty: 15 day trips — distances and seasons compared.
• Turgen gorge waterfalls — another Ile-Alatau gorge you can drive into.
• What to check before visiting a park.