Canada’s Floating Forest Island Vanished—Then Drifted Back Into View

A large, forest-covered mass briefly turned up as an unmarked island on British Columbia’s Williston Lake this summer—then disappeared from view before reappearing nearly 20 miles from where it was first seen. The unusual sighting began in late July, when a boater noticed what appeared to be a floating island on the reservoir. The mass was covered with trees and other vegetation and supported birds and additional animal life. Local resident Rocky Avery told the Canadian Broadcasting Corporation that he had never seen anything like it during his 40 years in the country. Photos and video were shared online in August ahead of a fishing derby and quickly spread. Bob Gammer, a spokesperson for B.C. Hydro, initially suspected the material might have been generated or altered using artificial intelligence. A satellite image taken July 21 later confirmed that the object was real. The image showed a green mass approximately 150 yards long and 75 yards wide—almost the area of two football fields. By mid-August, the island could no longer be found. B.C. Hydro located it again on August 31, roughly 20 miles northwest of its original position. In a September 2 post, the utility said the island had traveled about 30 kilometers over 15 days. Gammer suggested that the mass may have developed from logs and woody debris collected along the shoreline over many years. As the material decomposed, plants and trees may have taken root, creating a floating habitat. He linked its movement into open water to unusually high reservoir levels, following heavy winter snowpack and summer rain. That explanation is not settled. Geologist John Joseph Clague of Simon Fraser University said erosion and fallen trees occur in the lake, but he was doubtful that they would normally create such a large mat of forested material. The island’s precise origins therefore remain uncertain. Marine ecologist Rebecca Helm told National Geographic that similar floating bogs have appeared elsewhere, including Wisconsin’s Forty Acre Bog. B.C. Hydro has warned people not to approach, land boats on or climb onto the structure, saying its base is likely a thin, unstable layer of logs.