5 MIN READ
06-17-2026
Deep Into the Mangroves of Sembulungan Bay
Dika, 4ocean Jembrana Content Correspondent
After several days of unusually high tides, the 4ocean Java River Team returned to Sembulungan Bay to assess the impact on the surrounding coastline and mangrove ecosystems. Led by Team Captain Prayoga Setiawan, the crew prepared for another cleanup mission, knowing that rising waters often carry large amounts of debris into sensitive coastal habitats.
The team departed from the 4ocean Java base and traveled by pickup truck to the dock, where they boarded a boat bound for Sembulungan Bay. Along the way, the crew noticed elevated water levels in the river that serves as the route to the bay, a sign that strong flows had recently moved significant amounts of water and debris toward the coast.
Their first destination was the northern shoreline of Sembulungan Bay. After surveying the area and finding it relatively free of debris, the team made a decision to continue further south toward the mangrove forest.
There, they discovered a very different scene.
Hidden among dense mangrove roots and vegetation were plastic cups, food packaging, bottles, foam containers, and other waste carried in by currents and trapped within the ecosystem. What appeared clean from a distance revealed a buildup of debris tucked beneath the mangroves, where it could continue harming wildlife and disrupting the natural environment.
Working carefully through mud, roots, and thick vegetation, the crew began removing the waste piece by piece. Every item had to be extracted without damaging the mangroves that provide shelter and breeding grounds for countless species.
As the hours passed, dozens of sacks began to fill with recovered debris. By the end of the cleanup, rows of sacks lined the work area, representing both the scale of the problem and the impact of the team's efforts.
Once the cleanup was complete, the collected waste was transported by boat back to the dock, where it was weighed, documented, and loaded onto a pickup truck for transport to the 4ocean Java base for responsible processing.
Impact Details
The 4ocean Java River Team removed a total of 1,037.8 pounds of waste from Sembulungan Bay, filling 42 sacks during the cleanup operation. This included 821 pounds of plastic waste across 38 sacks and 216.8 pounds of mixed waste collected in 4 sacks. The wide variety of debris recovered included plastic cups, food packaging, plastic and glass bottles, bags, foam containers, and other materials commonly transported through rivers and coastal currents.
The cleanup took place within a dense mangrove forest, creating unique challenges for the crew. Thick vegetation, exposed roots, and muddy terrain required the team to move carefully throughout the operation.
Transporting the collected waste out of the mangrove area also demanded extra caution and coordination. Despite the difficult conditions, the crew remained focused on removing as much debris as possible while minimizing disturbance to the surrounding ecosystem.
A Message from the Crew
"Seeing the amount of plastic waste trapped among the mangrove roots made us realize that trash discarded carelessly by people never truly disappears. It simply moves from one place to another and eventually harms the natural environment that serves as a home for countless living creatures."
— Prayoga Setiawan
Protecting a Vital Coastal Ecosystem
Mangrove forests are among the most important ecosystems along Indonesia's coastline. They help protect shorelines from erosion, provide habitat for fish, crabs, birds, and other wildlife, and serve as important nurseries for marine species.
When plastic waste becomes trapped within mangrove roots, it can interfere with the health of the ecosystem and threaten the animals that depend on it. Much of this debris originates far from where it ultimately accumulates, carried downstream through rivers and waterways before becoming lodged in coastal habitats.
The cleanup at Sembulungan Bay serves as a reminder that waste does not simply disappear once it leaves our sight. The choices made upstream often have consequences far beyond their point of origin.
Through continued cleanup efforts and environmental stewardship, the 4ocean Java River Team hopes to help protect these critical habitats while encouraging greater awareness about the connection between rivers, coastlines, and the ocean. Every sack removed represents a step toward healthier mangroves, cleaner waterways, and a more resilient coastal environment.
