The area has been identified as the town of Aitoliko in western Greece by media reports, with the phenomenon attributed to mating spiders.
Giannis Giannakopoulos noticed the "veil of webs" earlier this week and captured the spider creations with his camera.
"It's natural for this area to have insects, no one is especially anxious", he said. Such large nests appearing rapidly are rare, though not unheard of.
The spiders are from the genus Tetragnatha, known as stretch spiders due to their elongated bodies.
A spider web spanning almost 1,000ft has appeared in Greece, where locals say unusually high mosquito activity took place before the web appeared.
Small mosquito-like insects with a lifespan of two to three days, gnats use most of their existence to reproduce.
Now Aitoliko formed the ideal conditions for mating.
"When these temperatures last long enough, we can see a second, third and fourth generation of the gnats and end up with large amounts of their populations", he said. They were presumably attracted by an increasing mosquito population in the area, the presence of water, and plenty of heat.
"It's the simple prey-predator phenomenon", Pergantis told the network.
In the interview, Democritus University of Thrace assistant professor Maria Chatzaki said: "The spiders will have their party and die soon". These spiders are not unsafe for humans and will not cause any damage to the area's flora.