Jade Gates
From A Wiki of Ice and Fire
The Straits of Qarth, also known as the Jade Gates,[1][2] is a narrow passage between the great city of Qarth on the south coast of Essos and the island of Great Moraq. The Straits connect the Summer Sea and the Jade Sea. As such it is a major trade hub between the east and west[3] from which Qarth derives its considerable wealth and power by taxing passing ships. The Straits are patrolled by the powerful Qartheen fleet. The island of Qal is located in or near the Straits of Qarth. The Cinnamon Straits is a similar passageway south of Great Moraq.