US soldiers stationed at Camp Casey, South Korea conducted their annual clean up of the Shincheon River that flows through Dongducheon:

Soldiers stationed near the North Korean border helped fill more than 80 trash bags with debris Thursday as they worked with local organizations to clean up the Shincheon River in their host city of Dongducheon.
Stars & Stripes
Dongducheon Mayor Choi Yong-deok and Lt. Col. Shane Doolan, the 210th Field Artillery Brigade deputy commanding officer, offered opening words of appreciation to the local residents and approximately 100 Camp Casey soldiers who were participating.
“We cannot meet spring with garbage from last winter,” Choi said before the annual event.
The volunteers began by throwing into the river biodegradable balls containing microorganisms aimed at preventing the growth of pathogenic bacteria.
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