Koajiro Forest is one of the largest firefly sites in the Kanto region, and fireflies are at their best. From May 23rd Thu. to June 2nd Sun., open from 18:21 to 1:XNUMX at night, you can enjoy a fantastic sight. Fireflies spend their larval life underwater and cannot live without a clean river throughout the year, shining through the forest of Koajiro with gentle light. Riviera staff also volunteer to guide you so that you can watch it safely. Why not take a stroll through the fantastic night forest where countless lights dance in the dusk.