Yangdà Âk County is a kun (county) in South P'yà Ângan province, North Korea.
The region is thought to be near the ancient chiefdom of dongye. Biryuguk used to be in the region. It was incorporated into Goguryeo around 40 BC.
Yangdà Âk County is divided into one à Âp (town) and 18 ri (villages):
Yangdà Âk county is served by Yangdà Âk Station on the Korean State Railway's P'yà Ângra Line.
In 2019, Yangdok Hot Springs Tourist Area was a key construction project, built on the site of Yangdok Recreation Center which opened in 1947. It was opened by Kim Jong-un on 7 December 2019. It featured indoor and outdoor baths, a ski slope, and a horse-riding park.