Lake Shikotsu is a caldera lake in Shikotsu-Toya National Park formed by a large volcanic eruption about 44,000 years ago. Voted first place for diving water quality for 10 consecutive years, swimming through Lake Shikotsu is said to feel like floating in the air. This tour for licensed scuba divers lets you discover the underwater wonders of one of Japan’s clearest lakes. Put on a diving suit and explore magical underwater areas like the ancient sunken forest and see volcanic activity up close in the “underwater Grand Canyon.” You may even encounter schools of rare fish along the way, including blue carp and brown trout over one meter long.
