According to Official Guinness Records,
The longest goza mat measures 537.27 m (1,762 ft 8 in) and was manufactured by Yashiro Green Project (Japan). It was displayed and measured at Honmachi-shotengai Arcade in Yatsushiro, Kumamoto, Japan, on 12 March 2011.
A goza mat is a Japanese style floor mat made form woven rushes.
For a complete list of 2011 records, please visit 2011 Guinness Records in Japan.