Ryongrim is a kun

Administrative divisions of North Korea

The administrative divisions of North Korea are organized into three hierarchical levels. Many of the units have equivalents in the system of South Korea. At the highest level are nine provinces, two directly governed cities, and three special administrative divisions. The second-level divisions...

, or county, in southeastern Chagang Province, North Korea

North Korea

The Democratic People’s Republic of Korea , , is a country in East Asia, occupying the northern half of the Korean Peninsula. Its capital and largest city is Pyongyang. The Korean Demilitarized Zone serves as the buffer zone between North Korea and South Korea...

. It borders Rangrim

Rangrim

Rangrim is a kun, or county, on the eastern flank of Chagang province, North Korea. It was created in 1952 from portions of Changgang and Changjin, as part of a general reorganization of local government. Originally part of South Hamgyong, it was transferred to Chagang province in 1954...

, Changjin, Chonchon

Chonchon (North Korea)

For other uses, see Chonchon Chonchon is a kun, or county, in central Chagang province, North Korea. Originally part of Kanggye, it was made a separate county in 1949. The terrain is high and mountainous; the highest point is Sungjoksan, 1984 m above sea level...

, Tongsin

Tongsin

Tongsin is a kun, or county, in southern Chagang province, North Korea. It borders Ryongrim and Chonchon to the north, the counties of Taehung and Yongwon in South Pyongan to the south and east, and Huichon and Songwon to the west and southwest...

, Taehung

Taehung

Taehung is a kun, or county, in the northeastern corner of South Pyongan province, North Korea. It is bordered to the north by Yongrim and Changjin, to the east by Yonggwang and Hamju, to the south by Yodok and Chongpyong, and to the west by Yongwon and Tongsin...

, and Songgan

Songgan

Songgan is a kun, or county, in central Chagang province, North Korea. It borders Rangrim to the east, Wiwon to the west, Kanggye to the north and Chonchon and Ryongrim to the south...

 counties. The county is mainly alpine territory. It contains many mountain peaks, such as Wagal-bong (2,260m), Ch'ŏnŭimul-san (2,032m), Rangrim-san (2,186m), Milpuldŏk-san (1,577m), Ungŏsusan (2,020m), Toma-bong (1,525m), Paktal-san (1,817m), Taeda-san (1,463m), and Sonamsan (1,178m).

In the standard dialect of South Korea

South Korea

The Republic of Korea , , is a sovereign state in East Asia, located on the southern portion of the Korean Peninsula. It is neighbored by the People's Republic of China to the west, Japan to the east, North Korea to the north, and the East China Sea and Republic of China to the south...

, Ryongrim loses its initial 'r' both in pronunciation and spelling. In addition, the second 'r' is assimilated in pronunciation to 'n' so that Ryongrim becomes Yongnim.