What is "potonggang-guyok"

Potonggang-guyok is one of the 19 districts, or guyok, of Pyongyang, North Korea. It is most famous as the location of the Ryugyong Hotel. It is named after the Pothong River (literally "the simple river"), which serves as the district's border on all sides. It is bordered to the north by Hyongjesan-guyok, to the east by Sosong and Moranbong-guyoks, to the south by Pyongchon and Chung-guyoks, and to the west by Mangyongdae-guyok. The district was established by the Pyongyang City People's Committee in October 1960.