Yangon River

A tidal estuary serving Yangon, Myanmar's largest city and former capital, where the Hlaing River takes on the Bago and passes the country's principal port before opening to the Gulf of Martaban on the Andaman Sea. In global plastic emission inventories the Yangon River ranks among the highest modeled outfalls anywhere, an outcome owed less to the river's length than to the dense port city packed along its banks.[1]

Last reviewed: July 20, 2026 Reviewed by: Plastic Bank Research Team

Why This River Matters

Myanmar's most storied river is the Ayeyarwady, but in modeled plastic emissions the short estuary at Yangon is the one that stands out. Meijer et al. (2021) rank the Yangon River at #37 among 31,819 modeled outfall points, with a midpoint estimate of 2,489 metric tons per year. That result fits the study's central pattern: small urban rivers close to the coast routinely outrank longer and more famous waterways, because plastic entering them has little distance to cover before it reaches the sea.[1]

The geography compounds the effect. Yangon occupies low-lying terrain at the eastern edge of the delta region, where the Hlaing River, known as the Yangon River along its final reach, receives the Bago River at the city and opens to the Gulf of Martaban, an arm of the Andaman Sea. Rainfall here follows a pronounced monsoon rhythm, and in the model framework precipitation and runoff are what move mismanaged waste from land into channels. A wet-season storm can carry litter from a street drain into tidal water in short order.[1]

Yangon itself concentrates much of the country's commerce. It is Myanmar's largest city, its principal seaport, and its former capital, and the estuary doubles as a working harbor lined with wharves, markets, and dense townships. UNEP's 2021 assessment ties riverine plastic emissions in rapidly urbanizing cities to gaps in waste collection and disposal, where services have not kept pace with rising consumption of packaged goods. Where those gaps sit close to tidal creeks, the path from household waste to open water is short.[2]

For an outfall with this profile, the sources describe a consistent toolkit: extend collection coverage into underserved districts, support the formal and informal workers who already recover material, and intercept plastic in drains and creeks before it reaches the main channel. UNEP frames these as complementary steps, since interception alone cannot compensate for waste that is never collected. Because the Yangon estuary is tidal and heavily trafficked, keeping plastic out of the water in the first place matters more than recovering it afterward.[2]

None of these figures are measurements taken in the river; they are modeled estimates built from data on waste generation, land use, rainfall, and geography. The underlying study puts global riverine plastic emissions at 0.8 to 2.7 million metric tons per year and finds that more than 1,000 rivers account for 80% of global riverine plastic emissions, a sharp revision of 2017 work that attributed most of the flow to a handful of giant rivers. Rankings like Yangon's #37 will keep shifting as inputs improve, but the qualitative lesson, that dense coastal cities dominate the list, has proven stable.[1]

Key Facts

What Drives Emissions Here

Monsoon season flushing. Heavy wet-season rainfall raises discharge and flushes litter from streets, drains, and creek banks into the estuary; precipitation-driven runoff is a core transport variable in the emission model.[1]

Uneven waste collection. Collection coverage in fast-growing districts is incomplete, and plastic that never enters a managed waste stream can leak into drains and tidal creeks.[2]

Short path to sea. The city sits on the estuary itself, so plastic entering the water has almost no distance to travel before reaching the Gulf of Martaban; distance to coast strongly shapes modeled emissions.[1]

Port and waterfront commerce. Yangon's harbor concentrates shipping, markets, and informal waterfront economies along the riverbanks, placing everyday packaging waste directly beside tidal water.[2]

Tidal estuary dynamics. Strong tides move water and floating debris through the channel daily, resuspending stranded litter and exporting it seaward on the ebb.[1]

Methodology Note

Figures cited are modeled estimates from global-scale studies; they are not direct measurements from continuous monitoring of plastic flux at the Yangon River mouth. Improving local waste data and field campaigns may refine these values. Use this profile to understand systemic drivers and regional context, not as a definitive audited mass balance.

Yangon River FAQ

How much modeled plastic emission is associated with the Yangon River?

This profile reports 2,489 metric tons per year for the Yangon River in the Meijer et al. (2021) global river plastic emissions framework. The value is a modeled annual estimate, not a continuous field measurement at the river mouth.

Is the Yangon River one of the most polluted rivers in the world?

For plastic specifically, the Yangon River ranks #37 of 31,819 modeled river outfall points worldwide in Meijer et al. (2021). "Most polluted" has no single definition, and this dataset models plastic transport to the ocean rather than overall water quality, so the ranking is best read as a plastic-specific indicator, not a general pollution verdict.

How does the Yangon River compare to other high-ranked rivers in Myanmar?

Myanmar has 2 rivers among the 50 named highest-emission outfalls in the dataset, and the Yangon River ranks second among them by modeled emission. Nearby entries from the same country include the Pazundaung Creek (#19).

Are the Yangon River figures direct measurements?

No. The figures on this page come from global-scale modeling that blends waste statistics, population layers, hydrology, precipitation, and distance-to-coast assumptions. They are best used for relative priority and context, not as literal tonnage measured by a permanent gauge.

Sources

  1. Meijer, L.J.J. et al. (2021). "More than 1000 rivers account for 80% of global riverine plastic emissions into the ocean." Science Advances, 7(18). DOI: 10.1126/sciadv.aaz5803
  2. UNEP (2021). "From Pollution to Solution: A Global Assessment of Marine Litter and Plastic Pollution." View report

How to Cite This Page

Plastic Bank. "Yangon River: Modeled Riverine Plastic Emissions." Rivers Carrying Plastic to the Ocean. https://rivers.plasticbank.com/rivers/yangon. Reviewed July 20, 2026.