
Fly fishing · June – October
Duration
6 days
Group size
Max 6
Season
June – October
Difficulty
Moderate
GALLERY
The trip
INTO THE WILD
Our expedition takes you deep into the remote wilderness of Khentii, following the Onon River through landscapes where rivers, forests, mountains and open steppe remain largely untouched. The journey begins in Ulaanbaatar, travelling by road toward Khentii before leaving the paved roads behind. From there, a true off-road expedition takes you deeper into the wilderness and toward our remote riverside camp.
There are no luxury hotels here. There are no crowds.
There is only wilderness, a river, a fly rod in your hand, and the possibility of seeing one of the greatest freshwater fish on Earth. Our camp is set up in tents, allowing us to remain close to the river and move with the landscape rather than build around it. This is Mongolia at its rawest.
THE TAIMEN
The world's largest salmonid. The ultimate freshwater predator. Taimen (Hucho taimen) are unlike almost anything else a fly fisherman can encounter. They can exceed 1.5 metres in length, with exceptional fish potentially weighing tens of kilograms. Their size is only part of what makes them extraordinary. Taimen are long-lived, slow-growing predators that can occupy enormous stretches of river throughout their lives.
Healthy wild populations survive in only a limited number of river systems, making every encounter meaningful. In the Onon River, scientific surveys have documented taimen exceeding 1.2 metres, while experienced fisheries report trophy fish reaching well beyond one metre. The fish you are looking for may be 80 centimetres.
It may be 100.
It may be 120.
Or, if Mongolia gives you the moment every angler dreams about, something much bigger.
That uncertainty is part of the addiction. You never know what is waiting beneath the next bank.
PROFESSIONAL GUIDING
One guide. Two anglers. One shared objective. Our fishing program is led by experienced local guides including Baganaa and Dulguun “DD”, who have spent more than six years guiding anglers through Mongolia's rivers.
They know the water. They understand taimen behaviour. And, most importantly, they know how to approach these fish.
Our standard ratio is:
1 professional guide : 2 anglers
This gives every fisherman individual attention while allowing our guides to focus on reading the river, finding productive water and helping you make the most of every opportunity. Whether you are an experienced international fly fisherman or casting for your first taimen, our guides adapt the experience to your ability. You don't need to arrive as a taimen expert.
You need to arrive ready for the adventure!
BEYOND THE RIVER
Khentii is much more than a fishing destination. Between fishing sessions, guests can experience the wider wilderness of Mongolia through:
Horse riding
Hiking
Wildlife watching
Landscape photography
Nomadic culture
Riverside camping
Exploring the surrounding wilderness
Guests can also choose to spend time with a local nomadic family for a more personal connection with Mongolian life. Because sometimes the greatest memories happen when the rod is back in the case.
Day by day
Meet your Black Yak Adventure team and begin the journey east from Ulaanbaatar. As the city disappears behind you, Mongolia opens into vast steppe and wilderness.
Your first full day on the river. Meet your fishing guides, understand the water and begin searching for your first taimen.
A full day dedicated to reading the river and targeting taimen. Deep pools, structure, current seams and changing water conditions become your hunting ground.
Another full day on the Onon. Our guides move you through different sections of water, constantly searching for the next opportunity.
Choose your rhythm — another full day of fishing or time to experience the surrounding wilderness through horseback riding, hiking, wildlife watching or photography.
One final morning on the river. One final cast. Then begin the journey back toward civilization, carrying photographs, stories and hopefully the memory of the fish you travelled across the world to meet.
Request the detailed itinerary — route maps, camping spots, packing tips. A real person replies within 24 hours.
BEFORE YOU BOOK
No open departures yet — contact us for the next season. Contact
REVIEWS
4x4 Overlanding
A 20-day self-drive expedition into the far western Altai of Mongolia. Take the wheel of your own Toyota Land Cruiser 79 camper and travel with a small convoy of up to five vehicles toward Altai Tavan Bogd, the Five Sacred Peaks, Potanin Glacier, Khurgan and Khoton Lakes, and the remote country surrounding them. Drive mountain tracks, cross rivers, climb into high country, camp beside alpine lakes and wake up to landscapes that change with the weather. This is not a fixed sightseeing tour. Routes move with the mountains, weather and conditions on the ground. You drive. The mountains make the rules.

4x4 Overlanding
A 14-day self-drive expedition across the wild Gobi Desert. Take the wheel of your own Toyota Land Cruiser 79 camper and travel in a small convoy of up to five vehicles, supported by a professional lead driver, expedition guide, mechanic, and private chef. There is no fixed tourist route. We move through the Gobi according to the terrain, conditions, and places worth stopping for — seeking remote valleys, open desert, rock formations, dunes, wildlife, and landscapes far from the usual tourist circuit. You drive. We lead, support, cook, maintain, and keep the expedition moving. One camper. Two people. Fourteen days of open country.

4x4 Overlanding
Self-drive expedition across the vast eastern country of Mongolia. Drive from Ulaanbaatar through Khentii and the lands connected to Chinggis Khaan, follow the Onon River into Onon-Balj National Park, cross the eastern steppe toward Choibalsan and the great Menen Steppe, then continue to Buir Lake and Khalkhgol — where the landscape carries the memory of one of the most important battles fought in Mongolia. Along the way, camp beside rivers and lakes, cross open steppe, follow remote tracks, meet nomadic families, explore historical sites and spend nights in places where the horizon seems to have no end. For days, the horizon is bigger than the road.
EAST WILD WATERS — Taimen Fly Fishing Expedition runs June – October. Tell us your dates and we will check availability within 24 hours.