In addition to these four main shrines, some sixty other auxiliary shrines scattered throughout the Lake Suwa area (ranging from miniature stone structures to medium to large sized edifices and compounds) are also part of the shrine complex.
During the festival, sixteen specially-chosen fir trees are felled and then transported down a mountain, where they are then erected at the four corners of each shrine. Festival participants ride the onbashira as they are slid down the mountain, dragged to the shrine, and raised, and the festival has the reputation of being the most dangerous in Japan due to the number of people regularly injured or killed while riding the logs.
This festival, which lasts several months, consists of two main segments, Yamadashi and Satobiki. Yamadashi traditionally takes place in April, and Satobiki takes place in May.