The National Geographic covered a story about the world's largest hand-woven rug in Iran at Tehran's open-air prayer grounds.

From the article:

At 60,546 square feet (5,625 square meters), the carpet is the size of a soccer field and was woven by 1,200 weavers in three villages over the course of a year and a half.
The mammoth floor covering is destined for a monumental new mosque under construction in the United Arab Emirates...Weavers in Iran's northwestern Khorasan Province used 38 tons of wool and cotton from Iran and New Zealand to fashion the colorful covering, tying a staggering 2.2 billion knots in the process.

---