http://www.naturalarches.org/big9.htm http://www.naturalarches.org/big9.htm Natural Arches.org: A Tour of the Big 14 Big 10 Tour. probably the 7th or 10th largest in the world http://www.naturalarches.org/big9.htm http://www.naturalarches.org/big9.htm http://www.naturalarches.org/big9.htm largest arch in the world http://www.naturalarches.org/big9.htm http://www.naturalarches.org/big9.htm "The Worlds Longest Natural Spans" largest or second largest http://www.naturalarches.org/big9.htm http://www.naturalarches.org/big9.htm probably the 7th or 10th largest in the world Big 10 Tour. http://www.naturalarches.org/big9.htm