
The largest spider web in the world is found in a sulfur cave, right on the Greek-Albanian border.
Deep inside a dark, sulfur-filled cave in Sarantaporo, on the border, researchers have discovered the world's largest spider web, with more than 111,000 spiders.
More specifically, according to a study published on October 17 in the journal Subterranean Biology, the massive spider colony consists of a colossal web in a permanently dark area of ??the cave.
The web stretches about 350 meters along the wall of a narrow, low tunnel near the cave entrance. The researchers noticed that it is a mosaic of thousands of individual, funnel-shaped webs.
This is the first evidence of colonial behavior in two common spider species and likely represents the largest spider web in the world, said study leader Istvan Urac, an associate professor of biology at Sapientia University in Romania.
"The natural world still holds countless surprises for us. If I were to try to put into words all the emotions that flooded me (when I saw the web), I would describe them as admiration, respect and gratitude. You have to experience it to truly know what it's like," Urak told Live Science.
This spectacular spider city is located in the "Sulphur Cave", a cave formed by sulfuric acid produced by the oxidation of hydrogen sulfide in groundwater.
Although the researchers discovered exciting new evidence about the spider colony in the cave, they were not the first to see the giant web.
Speleologists from the Czech Speleological Association discovered it in 2022 during an expedition to the Bromoner Valley.
Also, a team of scientists visited the cave in 2024, taking tissue samples that Urak analyzed before embarking on his expedition to the Sulfur Cave.