Yándé

Yándé was an old county name in the southwestern part of Hainan. It was first established under the Sui in 607. The Song restored the name for a short-lived county and then created Yándé Military Prefecture in 1107, with its seat at Tōngyuǎn. The new prefecture and its associated counties and stockades did not endure: an imperial order abolished them only a few years later. Their brief existence reflects the changing reach of Song administration across the island's interior and southern coast.