湖水祭は箱根神社の例祭の宵宮祭として、清祓式（湖水のお祓い）、献燈祭に続き箱根神社横の祭場で行われます。

https://www.hakone.or.jp/2379?gana=event

お祭りは次に湖水祭事へと進み、九頭龍明神に捧げる御供（三升三合三勺の赤飯）を積み宮司が一人乗る御供船は楽舟・御伴舟、二艘の見送りを受けて、夕闇の中湖心に進みます。

御供が捧げられる頃、期間最大規模の約4,000発の打ち上げ＆水中花火とともに、数百の灯籠が流され、夏の夜を煌びやかに彩ります。

湖畔では太鼓演舞に他多数の夜店も出、祭り情緒溢れる一日です！

A light festival

?https://www.hakone.or.jp/en/1043

Every July 31st, at Hakone Shrine,?one of the most important festivals of Hakone?is held in honor of the nine-headed dragon oｆ Lake Ashi.

At the beginning of the evening, the monks, on reproduction?pirate ships, sail on the lake and throw an offering of red rice and sake to the deified creature, while floating lanterns, toro-nagashi,illuminate the flat surface, peaceful, unmoved by the growing bustle on its shores.

A little further up, the sanctuary organizes various ceremonies as the crowd continues to grow and the food stall owners make a year’s worth of sales.

At around eight o’clock fireworks?light up the sky and the horizon. The trails of light are reflected on the lake that seems to come alive.