Okama

What it is

• A volcanic crater lake located on Mount Zao near the Miyagi and Yamagata border.
• Also known as Goshikinuma, meaning five-colored pond, due to its changing appearance.
• The water is highly acidic with a pH of 3.5 and contains no living organisms.
• A popular natural landmark attracting approximately 300,000 visitors every year.

What to see

• Water colors that shift between different shades depending on volcanic activity.
• A deep crater reaching a maximum recorded depth of 63 meters.
• Views of the surrounding Goshikedake and Katta-dake mountain peaks.
• The rugged volcanic landscape of the Zao mountain range.

When to go

• Accessible via the Zao Echo Line road from April through November.

Getting there

• Public buses run to the site from Shiroishi-Zao and Yamagata stations.
• The Zao High Line road leads directly to a nearby parking area.

Notes written by Japan Gems from facts in Japanese Wikipedia.