Straits of Koryo

The Straits of Koryo were the channels of water lying between the Koryo Peninsula and the island of Saishu and the other small islands between them.

Tides
The Straits of Koryo were famed for their huge tidal ranges and speeds: the water could rise a distance of 30 feet (9.1 meters) in only two hours. Low tide exposed the sea bed by the shore.

Fauna
The Straits of Koryo were home to prides of sea lions that menaced sailors, and huge orange crabs called dikanie.

Hazards
When the tide went out, an unwary sailor could find their boat beached for hours in the mud. Worse, they became prey for the dikanie.

History
The fishermen of In'ani and Ansong, on either side of the Straits of Koryo, had eliminated the dangerous prides of sea lions before 1357 DR. For this and other achievements, they were claimed to be the best in the world.