ZION NATIONAL PARK, Utah — An Ohio woman died after a fall while working her way through a canyon at Zion National Park in Utah.

The accident happened Thursday, Sept. 5, in the Subway, a section of the left fork of North Creek, while Cheri Haas was leading a group of friends, according to the National Park Service. Haas fell more than 100 feet.

Below is the park service account of what happened:

It appears she missed a hard right turn down a steep 4th class scramble and instead went towards a cliff edge, when she slipped and fell from view. The woman’s boyfriend rappelled down to her while the other two members of the group hiked out and phoned for help.

The route takes seven to nine hours to complete and requires working past numerous boulders, ledges and waterfalls, as well as wading and swimming through several miles of cold water.