Twetch ·
Yes, Lake Biwa (琵琶湖) north of Kyoto is the only big lake in Japan. 670 km2 and in the center of Japan. Next is Kasumigaura (霞ヶ浦) with only 167 km2.
@chiura I wish you big success for promoting Biwako, I will watch from Nagoya and want to learn from you.