Lake Mashu Japan Postcard

Lake Mashu is often cited as the clearest lake in the world, a deep caldera lake enclosed by steep, 200-metre-high crater walls. Because there are no inlets or outlets, the water remains incredibly still and pure, earning it the nickname 'Mashu Blue' for its intense, dark sapphire colour. The lake is frequently shrouded in a thick mist, which adds to its reputation as a mysterious and spiritual place. Visitors can view the lake from observation decks perched on the crater rim, looking down into the silent, cobalt depths that seem to hold the secrets of the ancient volcanic earth.