A massive tree-covered island mysteriously emerged in a remote Canadian reservoir before vanishing from sight just weeks later.

The bizarre floating landmass was spotted in British Columbia’s Williston Reservoir — a sprawling man-made lake north of Mackenzie — earlier this month, according to CBC.

Local Rocky Avery said photos and video of the island were taken by a boater and later shared with him before he posted them on social media, where they quickly went viral.

“It was a pretty amazing sight to see, never seen anything like that in my 40 years in this country,” Avery told the outlet.

“There was a big fishing derby coming up, so I wanted to…

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