Shimenawa (標縄/注連縄/七五三縄, lit. 'enclosing rope') are lengths of laid rice straw or hemp rope used for ritual purification in the Shinto religion.
Shimenawa vary in diameter from a few centimetres to several metres, and are often seen festooned with shide—traditional paper streamers. A space bound by shimenawa typically indicates a sacred or ritually pure space, such as that of a Shinto shrine. Shimenawa are believed to act as a ward against evil spirits, and are often set up at a ground-breaking ceremony before construction begins on a new building. They are often found at Shinto shrines, torii gates, and sacred landmarks.