A huge spiral covering 100,000 square metres discovered in the Indian desert may be the largest drawing ever made, according to experts, who say it dwarfs the Nazca lines in South America.
The spiral artwork is made up of a series of small geoglyphs covering an area of about a million square feet in the Thar desert in India, first spotted on Google Earth by Carlo and Yohann Oetheimer, a father and son research team from France.
Nazca lines in Peru are a group of geoglyphs etched into a 380 sq mile area of desert sands dating back to at least 500 BCE, featuring figures of animals and plants.
While the South American geoglyphs are more plentiful, with up to 300 characters, and cover a larger area, a line in India is significantly larger than any one Nazca line.
The lines make up four distinct symbols, created by scraping sand and silt near the village of Boha, with the largest single symbol 2,374ft long and 650ft wide, made of a single seven and a half mile line spiralling inwards.
Study authors, not affiliated with any institution, say the lines are at least 150 years old, but can't say anything more specific, adding their meaning is lost to history.
The duo searched through images on Google Earth showing the desert for unusual features.
In the images they found eight possible sites, eventually discounting seven of them as being natural features.
The pair took a drone to the region in 2016 and flew it over the site.