There are various small streams, including the Tongch'ŏn (동천), Songgyech'ŏn (송계천), and Namch'ŏn (남천). These are used to transport cut lumber; and the Namch'ŏn is also used to generate hydroelectric power.
Several small streams, such as the Tongch'ŏn (동천), Songgyech'ŏn (송계천), and Namch'ŏn (남천), are used to transport sawed timber. Furthermore, the Namch'ŏn is also utilized for producing hydroelectric power.