Onbashira (御柱) is a festival held every six years in the Lake Suwa area of Nagano, Japan. The purpose of the festival is to symbolically renew the Suwa Taisha or Suwa Grand Shrine.
The Onbashira festival is reputed to have continued, uninterrupted, for 1200 years. The festival is held once every six years, in the years of the Monkey and the Tiger in the Chinese zodiac.
Onbashira lasts several months, and consists of two segments, Yamadashi and Satobiki. Yamadashi traditionally takes place in April, and Satobiki takes place in May (just finishing for 2016).