cogon grass ring; sacred grass hoop
A large ring made of cogon grass (茅, ちがや) used in Shinto summer purification rites (夏越の祓). People pass through it to purify themselves and pray for good health.
See also: 夏越の祓
A large cogon grass ring was set up in the shrine grounds.
During the summer purification rite, people pass through the grass ring to cleanse themselves of the impurities of the past half year.