Fukushima Prefecture has announced that Lake Inawashiro is in the peak season for its naturally occurring 'spray ice,' a rare phenomenon in Japan. This comes as a special time for the region, closely following the lake's designation as a Ramsar Convention site in July 2025.
The phenomenon, known locally as 'shibuki-gori,' occurs when strong winter winds cause the lake's waters to freeze on trees lining its shore. This stunning natural occurrence is not only a remarkable sight but also highlights Lake Inawashiro's ongoing environmental significance and conservation status.
Lake Inawashiro spans 10,960 hectares and is Japan's fourth-largest lake, serving as an essential habitat for a wide range of wildlife. It supports 197 animal species, including 111 bird varieties, and hosts more than 100 species of aquatic plants. The shoreline is home to 705 species of terrestrial plants, underscoring its vital role in preserving biodiversity.
The Ramsar Convention registration recognizes Lake Inawashiro's critical ecological value and aims to bolster conservation efforts while promoting sustainable utilization of the lake's resources. The lake's ecosystem supports local livelihoods, providing water for agriculture, power generation, and driving tourism to the area.
To witness the 'spray ice' phenomenon, optimal viewing seasons are January and February, though visibility is dependent on weather conditions. Strategic viewing locations include areas around Tenjinhama in Inawashiro Town and Hamajihama in Konanmachi, Koriyama City. Roughly a 15-20 minute bus or car journey from JR Inawashiro Station will take visitors to these spots. The region offers many accommodations and other tourist attractions, providing a full day's worth of nature-based activities.
Visitors planning to see the 'spray ice' are advised to dress warmly for the excursion and ensure cars are equipped with snow tires and chains for safety. The announcement underscores both the allure and environmental import of Lake Inawashiro, highlighting efforts to preserve this unique natural venue under international conservation frameworks.
