Jade Gates
From A Wiki of Ice and Fire
Straits of Qarth, also known as the Jade Gates,[1][2] is a narrow passage, located close to the great city of Qarth on the south coast of Essos and connecting 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.