Usi 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 westernmost 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 looks across the Yalu River

Yalu River

The Yalu River or the Amnok River is a river on the border between North Korea and the People's Republic of China....

 into the People's Republic of China

People's Republic of China

China , officially the People's Republic of China , is the most populous country in the world, with over 1.3 billion citizens. Located in East Asia, the country covers approximately 9.6 million square kilometres...

. Within North Korea, it borders Chosan

Chosan

Chosan is a kun, or county, in Chagang province, North Korea. It borders the People's Republic of China to the north.The terrain slopes downward from the Kangnam Mountains in the south to the Yalu River in the north. The highest peak is Namhaetaesan . Some 20% of the land is arable, with animal...

 and Kopung

Kopung

Kopung is a kun, or county, in Chagang province, North Korea. Prior to the division of Korea, it was part of Chosan county.-Geography:Most of Kopung is mountainous, but lower in the west. The Kangnam and [Chogyuryong ranges pass through the county. The chief streams are the Chungman River and the...

 to the east, Songwon

Songwon

Songwon is a kun, or county, in southwestern Chagang province, North Korea. It borders Usi and Kopung counties to the north, Tongsin to the east, and Huichon to the south, as well as North Pyongan's Tongchang county to the west...

 to the south, and North Pyongan's Pyoktong

Pyoktong

Pyoktong is a kun, or county, in northern North Pyongan province, North Korea. It lies in the valley of the Yalu River, and borders China to the north. Within North Korea, it is bounded by Tongchang in the south, Changsong in the west, and Usi county in Chagang province to the east...

 county to the west. Originally part of Pyoktong, it was made a separate county in 1952 as part of a general reorganization of local government; in 1954, it was transferred from North Pyongan to Chagang.

There are no railroads in Usi, but it is connected by road to the neighboring districts of Chosan and Pyoktong, and beyond Pyoktong to Sinuiju

Sinuiju

Sinŭiju is a city in North Korea, neighboring with Dandong City, China via international border and is the capital of North P'yŏngan Province...

. In addition, the Yalu is used for transportation. The stretch of the Yalu in Usi is part of the massive "Lake Supung" (수풍호), North Korea's largest reservoir.

The Yalu valley is farmed for rice, while the upland regions produce maize, potatoes, and sesame

Sesame

Sesame is a flowering plant in the genus Sesamum. Numerous wild relatives occur in Africa and a smaller number in India. It is widely naturalized in tropical regions around the world and is cultivated for its edible seeds, which grow in pods....

. There is little manufacturing. The county's Kaha-ri district is known for its medicinal waters.