In the September 19 news digest, there was an item you could easily scroll past: in the Canadian Williston Reservoir, a "missing island" was found drifting 30 kilometers from where it was first spotted. Sounds like a tall tale from the "obvious yet incredible" file: a forested mass the size of two football fields appeared out of nowhere, vanished from satellite images, then turned up at someone else's shore. The news itself offered a prosaic explanation — it's not an island, but a raft of logs accumulated over decades, on which trees took root.
But it was precisely this "prosaic" quality that hooked me. Dig deeper and you discover: floating forests are not a fluke or a curiosity, but a legitimate landscape type with its own science, a two-thousand-year history, and its own drama. Scientists call such islands "a disappearing landform": the industrial dams and log drives that once made them possible are the same forces that destroyed them. And the "ghost island" from Williston itself turned out to be not an anomaly, but a symptom — the last living representative of a once-common phenomenon that humanity nearly wiped out without noticing.
It all started with a video. A boater filmed something incredible: a densely tree-covered patch of land that rocked and swayed on the waves, as if overfilled with steam. The recording reached Rocky Avery, a local with forty years of living on these shores, and he posted it online — not for sensation at first, but to warn fishermen about a navigational hazard. "Incredible sight. In forty years in this country, I've never seen anything like it," he admitted.
BC Hydro employee Bob Gammer responded like a true resident of the 2020s: with skepticism. "In the AI era, it's important to verify unusual reports before drawing conclusions," he later explained to journalists. Not every video deserves trust at first glance, and without corroborating witnesses, the story looked like a typical deepfake. What convinced him was a satellite image from July 21: the island really existed — roughly 140 meters long, 70 wide, about 9,800 square meters, in the main body of the reservoir.
Then the object vanished. By August 5, satellites no longer saw it, and the utility had its own rather mundane hypothesis: "doesn't mean it went to the bottom — it may have returned to a more sheltered area near shore." Then — a week of silence, a hurricane of headlines from BBC to TMZ, and the denouement on August 31: satellite data from August 15 showed the island at the Ospika arm, 30 kilometers northwest of the first sighting. In fifteen days, the forest mass traveled thirty kilometers and neatly moored itself to shore. It drifted even farther from the dam than before — and that, by the way, upset no one: even if the island had reached it, it would have just leaned against it and stopped.
How does an entire forest stay afloat? The key is in the physics of wood. A fresh log sinks: the dense heartwood is heavier than water. But a log that's spent years in water absorbs water only partially — its bark and sapwood, filled with air and resins, keep it afloat. Over time, logs in a quiet backwater compress into a single mat, gaps between them fill with rotting organics, and the whole structure turns into something like a sponge: partly in water, partly above it.
Then biology enters. Seeds brought by wind and birds sprout right in the layer of decomposing wood — and it, according to Gammer's assessment, works "like hydroponics": "well-fed trees on a rotting source of nutrition with lots of water… could grow very fast." Roots sew through the entire mat, binding separate logs into a single organism. Researcher Natalie Kramer Anderson, who studied giant logjams in northern Canada, describes how she once cored a fifty-year-old spruce growing on such a log pile: "As I was coring, water was running under the tree. They were just growing on a log." You couldn't say it better: a floating forest is a tree growing on a cemetery of other trees.
There's also a less obvious mechanism working in soft bottom sediments. Microbes decomposing organics in the oxygen-free thickness of silt release methane and carbon dioxide; bubbles get trapped in sediment and biofilms, adding buoyancy until a piece of shore finally breaks away. The trigger is almost always the same: seasonal water arrhythmia. In the dry period, vegetation takes hold on exposed mudflats, and when water returns — it floats up along with the shore. In Williston in 2026, conditions aligned perfectly: the reservoir stood higher than it had in the previous fourteen years.
Here the story of the Williston island acquires a second, less innocent layer. Williston is not a lake, but a man-made reservoir: it was created by the W. A. C. Bennett Dam on the Peace River, filling began in 1968 and finished with a full basin in 1972. It's an earth-fill embankment 183 meters high and two kilometers long, one of Canada's largest hydroelectric stations, and the reservoir itself is the third-largest artificial lake in North America and seventh in the world by volume. Under water went about 350,000 acres — over 1,400 square kilometers of forest.
And here's the detail that explains everything. Before flooding, they cleared only 21.7 percent of the territory — mainly along navigable channels. The rest went underwater as is. Naturally, since then, woody debris has been Williston's chronic illness: already in 1985, floating wood covered 4.8 percent of the reservoir's surface, that's 8,256 hectares. According to a 2011 estimate, about 1.3 million cubic meters of debris accumulated along the shores, and two-thirds of that volume was in the Finlay Reach, the very area where half a century later the floating forest was found. The island didn't mutate from nowhere: it was literally baked by a factory operating since 1968.
At the same time, the finding itself is not something extraordinary for reservoirs as a class. In Wisconsin, on Lake Chippewa Flowage, also created by flooding in 1923, floating peat islands are a regular infrastructure problem. Every June, forty to fifty boats line up and push the latest broken-off peat mass away from the bridge — at one kilometer per hour, via radio, for hours. Locals call it "bog pushing," and one organizer describes the process with a negotiator's honesty: "It's like an iceberg. It's not a leaf on the surface of the water."
Humanity has known about floating islands for so long that the phenomenon has developed its own cultural history — an entire volume was devoted to cataloging it: 428 pages of "global bibliography" by Chet Van Duzer (2004), collecting descriptions of floating islands from antiquity to modernity. In South Sudan, the name Sudd — Arabic for "barrier" — became generic for any large floating vegetation mat: the Sudd swamps on the White Nile blocked navigation so thoroughly for centuries that in 61 CE, Roman soldiers of Emperor Nero couldn't pass them — that was the limit of Roman penetration into equatorial Africa. Early explorers seeking the source of the Nile spent months getting through the Sudd. And from 1879 to 1900, papyrus torn loose by floods regularly blocked channels.
Ancient authors left descriptions of floating islands long before satellites: both Seneca in "Naturales quaestiones" and Pliny the Elder in "Natural History" wrote about floating islands in Lakes Cutiliae and Vadimone in Italy. One Italian floating island, at Lake Posta Fibreno, survives to this day: a four-meter floating peat bog, one of the few survivors in Southern Europe, with aspens that appeared only in the last twenty years. In India, the phenomenon reached its logical limit: on Lake Loktak exists Keibul Lamjao — the world's only floating national park, forty square kilometers of vegetation mat that holds the last refuge of the dancing Sangai deer. And about the Williston find itself, National Geographic, through ecologist Rebecca Helm, said a phrase worth highlighting: "This island feels more like an old ghost than a shocking new phenomenon — something people used to see much more often."
Sometimes people build floating islands — and also for centuries. On Titicaca, the Uru people have lived for over five hundred years on artificial islands made of layers of totora reed, which even today must be constantly renewed: a structure "in constant flux of creation and decay," as the BBC puts it. In Bangladesh, floating gardens made of water hyacinth are a traditional practice that FAO nominated as global agricultural heritage: yields on floating beds are ten times higher than on comparable land. And nature can make floating "islands" even from stone: after the underwater eruption of Havre volcano in 2012, a pumice mat up to 26,000 square kilometers — about two-thirds of Belgium — drifted across the southern Pacific Ocean for months.
The most interesting thing about a floating forest is that it's not a landscape, but a vehicle for life. On Lake Victoria in 2022, scientists documented a rare event: a floating island measuring 7.1 hectares broke away from shore near Kasheka village and over two weeks traveled 15 kilometers, driven by winds up to forty kilometers per hour. On it they counted 27 plant species from 11 families, three tree species including figs, a rare terrestrial orchid listed in CITES, monitor lizards, green snakes, and nesting birds. A full-fledged floating sanctuary — just without a fence or guards.
There was drama there too: by the time researchers reached the island, locals had already cut down all its trees — for firewood, medicine, and, among other things, witchcraft purposes. The sudden appearance of the island at shore was interpreted by the village as a supernatural sign, and from an anthropological perspective, this is exactly the same plot as in ancient Rome: humanity for millennia hasn't known what to do with land that sails.
The Williston island, apparently, is also not empty. Observers suspect the root system in the water hides "the best fish in the lake," and on the surface live birds and small animals among coniferous and deciduous trees. Global News cited an estimate that the island is probably inhabited by "various species of fish, birds, trees, and small animals living among the tangle of branches that hold the structure afloat." The real problem is not ecology, but physics: Gammer warned that the video shows trees swaying on a "delicate thin layer of logs," and he categorically advised against climbing on the island. Avery, however, saw it differently: "I would totally jump on that island if I could."
The most non-obvious conclusion from the whole story was drawn not by journalists, but by scientists. For Kramer Anderson and Helm, the forested floating island is not a curiosity, but a "disappearing landform." The logic goes like this: floating islands historically formed where rivers carried lots of wood downstream, and there was somewhere to pile it. Two industrial revolutions — dams and log drives — broke both conditions. Rivers blocked by hydroelectric dams no longer transport trunks to the sea; timber companies collect logs into booms long before they can take root; reservoirs, the only places where the old mechanism still works, clear debris for navigation and turbines. In the Pacific Ocean, as researchers wrote in Hakai Magazine, drifting wood has become so scarce that its place in marine food webs is being taken by plastic.
Hence Williston's ambiguity: this island exists only because once upon a time they built a dam, flooded an entire forest, and forgot about it for half a century. A man-made catastrophe birthed a renaissance of a phenomenon that man himself destroyed. And then simple geography will decide everything: with a dam downstream, the island has nowhere to go — it will either attach to shore or gradually fall apart. Scientists can only ask to be sent a core from its trees, to understand from growth rings whether they grew for decades or all at once. The question, by the way, is not academic: the answer determines how many more such "ghost islands" are maturing in the quiet backwaters of reservoirs around the world — and how many of them will live to see their boaters.