Umihotaru Parking Area, Artificial island rest area in Tokyo Bay, Japan
Umihotaru is a rest area on an artificial island in Tokyo Bay, Japan, rising five stories with parking on three floors. The upper levels hold shops, restaurants, and viewing areas arranged in a circular pattern around the center of the structure.
The artificial island opened in 1997 as the midpoint of the Tokyo Bay Aqua-Line, a bridge-and-tunnel route linking Kisarazu to Kawasaki. It serves as the transition zone where vehicles switch between the bridge section and the underwater tunnel.
The name translates as "sea firefly," referring to the small glowing organisms that once lit up Tokyo Bay waters at night. Today the facility brings together food from different regions, with families stopping on road trips to try local specialties and travelers browsing souvenir shops that stock items from both Chiba and Kanagawa prefectures.
The facility stays open around the clock and allows visitors to move between floors using elevators or stairs. Restrooms appear on every level, and dedicated pet areas let travelers take short breaks with animals during the drive.
The island sits roughly 650 meters offshore and offers full views of open water with no land visible in some directions. On clear days visitors can see Mount Fuji from the observation deck, while at night the lit skyline of Yokohama appears on the horizon.
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