西湖
From Openwaterpedia
西湖 (or 'Sai-ko' or Lake Sai) shares its banks with the Aokigahara Jukai Forest and is part of the Five Lakes of Mount Fuji in Japan.
The Five Lakes of Mount Fuji include Lake Yamanaka, Lake Kawaguchi, Lake Sai, Lake Shoji, and Lake Motosu, and have been successfully traversed by both Lynne Cox in 1985 and Steven Munatones in 1992.