Heilongjiang · A Lake Held In by Lava
Jingpo Lake (镜泊湖)
A long lake in northeast China, dammed not by a wall but by a basalt flow that blocked the valley. The waterfall at its outlet is spectacular in ice and can shrink to one corner of the cliff in summer.
Quick Facts
The Short Version
| What it is | A lava-dammed lake on the Mudan river, with a waterfall at its outflow and volcanic craters in the forest nearby |
|---|---|
| Where | Ning’an, under Mudanjiang, in southern Heilongjiang |
| How it formed | Basalt flows from a nearby volcanic field ran into the river valley and blocked it. The water backed up behind the lava |
| The waterfall | Diaoshuilou, at the outlet. The scenic area gives it as roughly 20 metres high and 40 metres wide, though the width depends entirely on the flow |
| The catch | Flow is seasonal and is also managed, because there is a hydroelectric station on the outflow. In low water it runs over only part of the cliff |
| In winter | It freezes into a wall of ice, which is the most reliable version of the sight |
| Also in the area | An underground forest: collapsed volcanic craters with mature woodland growing inside them |
| Time needed | A full day. Two if you want the craters as well |
Why Go
Lava Made It, and Water Level Runs It
1. A dam with no engineer
Most large lakes in eastern China are either tectonic basins or reservoirs behind concrete. This one is neither. A volcanic field a short distance north erupted repeatedly, and the basalt ran downhill into the valley of the Mudan river and set there. The river backed up behind it into a long, narrow, branching lake, and it has been draining over the top of that lava ever since.
That makes it a natural pair with the crater lake at Changbai Mountain, 200 km southwest. The same regional volcanism produced both, by opposite methods: one blew a hole and filled it, the other blocked a valley and flooded it. Seeing the two in a week is the cheapest geology lesson in the northeast.
2. Whether there is a waterfall depends on the day
The outflow drops over the lip of the lava dam, and that drop is the site’s main attraction. It is also the least dependable thing about it. Flow varies with the season, and it varies with how much water is being held back, because there is a hydroelectric station on the outflow and the lake is operated as well as admired.
The two pictures below are the same cliff. One is winter, with the whole face hung in ice. The other is summer with the flow down to a single corner of the horseshoe and the rest of it bare rock. Neither is unusual. If the waterfall is why you are going, go in late spring after the melt, or go in deep winter for the ice, and do not go in a dry August expecting the postcard.
The catch. The scenic area is large and spread along the lake, the shoreline near the falls is built up with hotels and stalls, and getting between the parts means driving or a shuttle. It is also a long way from anywhere: Mudanjiang is the nearest city and Harbin is four to five hours away. In peak summer weeks the viewing platforms at the fall are crowded even when the fall is not running.
Orientation
Getting There, and What Is Where
Mudanjiang is the gateway, with rail and a small airport, and the lake is about an hour and a half away by road. Harbin is the nearest large city and is a long half day away. There is no sensible way to do this as a day trip from anywhere but Mudanjiang.
Inside, the waterfall and its viewing platforms are at the north end near the outlet, the lake cruises leave from piers nearby, and the underground forest is a separate drive. Give the fall an hour, the boat two, and the craters half a day if you want them.
Practical
Things Worth Knowing
Ask about the flow before you buy a ticket
Local operators and the scenic area know what the fall is doing that week. It is a fair question and it changes whether the trip is worth making.
Winter is the stronger visit
Ice, very few people, and the frozen fall is genuinely remarkable. It is also brutally cold, so dress for minus twenty.
The craters are the underrated part
Walking down into a collapsed volcanic crater with full-grown trees inside it is stranger than the waterfall and almost nobody bothers.
Pair it with Changbai, not with Harbin
The two volcanic lakes together make a trip. The lake plus a city does not.
Timing
When to Go
| Season | The case for | The catch |
|---|---|---|
| December to February | The fall frozen into an ice wall, snow on the forest and almost no visitors | Extreme cold, short days and some services closed |
| May to June | Snowmelt in the river, which is the best chance of the fall running properly | Mosquitoes arrive with the warmth |
| July to August | Warm, everything open, lake cruises running | The domestic peak, and often the lowest flow at the fall |
| September to October | Birch and larch turning, clear cold air and thin crowds | Snow can arrive in October and close the upper roads |
Context
A Volcanic Corner of the Northeast
The volcanic field behind this lake is part of a belt of recent volcanism that runs through the northeast, and Changbai Mountain to the south belongs to the same story. Eruptions here were smaller and more frequent than the one that blew the top off Changbai, and they produced sheets of basalt rather than ash: the flat dark rock the river runs over, the lava dam, and the collapsed craters in the forest.
The underground forest is the strangest result. Craters from the eruptions collapsed inward, leaving deep bowls in otherwise level woodland, and the bowls filled with soil and grew their own forest at the bottom. Standing on the rim you look down into the crowns of mature trees growing inside a volcano.
The lake has been used as well as looked at. The hydroelectric station on the outflow was one of the earlier ones in this region, and it is the reason the water level is a decision rather than a given. That connects this page to a number of others on this site: in China, a great deal of famous water is operated.
Nearby
Other Stops on the Same Trip
Spot · 215 km southwest
Changbai Mountain (长白山)
The crater lake on the North Korean border, made by the same regional volcanism and by the opposite mechanism. The pairing this page argues for.
Inside the scenic area
The underground forest (地下森林)
Collapsed volcanic craters with full-grown woodland inside them, a drive from the waterfall and largely ignored by visitors.
Where to Base
Mudanjiang (牡丹江)
Mudanjiang is the base: a working northeastern city with rail connections, an airport and enough hotels, about ninety minutes from the lake. It is not a destination in itself and does not pretend to be.
Harbin is the regional hub and the usual arrival point for foreign visitors, four to five hours away. The sensible shape is Harbin, then this lake, then south to Changbai, which turns an out-of-the-way lake into part of a coherent week.
Experiences
What You Can Actually Do Here
On site · 2 hr
The fall and the platforms
The viewing decks around the horseshoe, and the path down to the pool below when it is open.
On site · 2 hr
The lake by boat
Upstream into the branching arms of the lake, which is where the lava dam actually makes sense as a shape.
Guided · 6 days
Two volcanic lakes
Harbin in, this lake, then south to Changbai for the crater and the forest zones, with a driver for the long legs.
Ask what the water is doing before you commit, and go in winter if you can take the cold: the frozen fall is the version that never disappoints. Whatever the season, take the boat up the lake and look at the shape of it, because that long branching outline is the whole point. It is a river valley with a lava plug in the end of it, and the waterfall is simply the water getting over the plug.
Put the Two Volcanic Lakes Together
Tell us your dates and our local team will check what the waterfall is actually doing that week, book the lake boat, and run the long drive south to Changbai so the two lakes read as one trip.