What works to address Mekong Delta Wetland Loss Threatens Biodiversity?

Protecting and restoring wetland floodplain connectivity can help sustain fisheries, biodiversity, and flood buffering, according to conservation assessments of the Mekong Delta.[4][6] Reducing sand mining and limiting groundwater extraction address two identified drivers of erosion and subsidence in the delta.[7] Managing upstream sediment flows and hydrology is important because sediment starvation is identified as a major cause of shoreline retreat and land loss.[7][9]

How can I help with Mekong Delta Wetland Loss Threatens Biodiversity?

Donate to organizations working on Mekong Delta wetland conservation, such as IUCN and local conservation partners. Support NGOs and community groups involved in mangrove restoration, fisheries protection, and climate adaptation in Vietnam and the Lower Mekong. Advocate for stronger groundwater regulation, sand-mining controls, and transboundary river management in the Mekong basin.

Biodiversity & Ecosystems

Mekong Delta Wetland Loss Threatens Biodiversity

Severity

8/10

Impact

250.0Mpeople

Trend

worsening

Cost

$2.8B

The Mekong Delta continues to lose wetlands, shorelines, and riverbanks because of sediment starvation, sand mining, groundwater extraction, upstream hydropower, and climate stressors such as drought and sea-level rise. IUCN says wetland loss in the Lower Mekong threatens biodiversity, fisheries, water security, infrastructure, and livelihoods for nearly a quarter of a billion people across five countries. In Vietnam’s Mekong Delta, recent and longer-term studies show severe ecological decline. Research has found mangrove area fell from 185,800 hectares in 1973 to 102,160 hectares in 2020, while a review found that less than 5% of the Delta’s natural wetlands remain. Another study links rapid shoreline erosion to reduced sediment supply, large-scale sand mining, and groundwater-driven subsidence, with erosion affecting more than 300 km of shoreline and over 50% of the more than 600 km coast during 2003–2012. Agricultural livelihoods are also under pressure from salinity intrusion and drought. Recent research on Vietnamese Mekong Delta paddy fields reports cumulative paddy loss of 542.98 thousand hectares and net loss of 152.55 thousand hectares from 2000 to 2022, with indirect drivers accounting for 74.86% of losses when urban conversion is excluded. World Bank-linked material cited in the literature reports groundwater extraction-induced subsidence of 1.0–4.7 cm/year in 1991–2016, reinforcing the risk of continued land loss and infrastructure damage.

Recent Developments

012022: IUCN reported that wetland loss in the Lower Mekong is affecting biodiversity, fisheries, water security, infrastructure, and livelihoods across five countries.

022023: A review in the scientific literature linked Mekong Delta deterioration to hydropower dams, drought, salinization, sea-level rise, and related downstream water shortages.

032020: Research on the Mekong Delta documented mangrove decline from 185,800 hectares in 1973 to 102,160 hectares in 2020.

04Recent studies continued to attribute paddy-field losses in the Vietnamese Mekong Delta to salinity intrusion, drought, and other indirect drivers from 2000 to 2022.

Interventions

IUCN-led Lower Mekong wetland conservation and policy work focused on reducing wetland loss and improving ecosystem resilience.
Nature-based and integrated delta-management approaches promoted in the conservation literature, including restoring wetland functions and improving floodplain connectivity.
Research and monitoring efforts tracking erosion, subsidence, salinity intrusion, and sediment loss to support adaptation planning.

What Works

Protecting and restoring wetland floodplain connectivity can help sustain fisheries, biodiversity, and flood buffering, according to conservation assessments of the Mekong Delta.
Reducing sand mining and limiting groundwater extraction address two identified drivers of erosion and subsidence in the delta.
Managing upstream sediment flows and hydrology is important because sediment starvation is identified as a major cause of shoreline retreat and land loss.

How to Help

Donate to organizations working on Mekong Delta wetland conservation, such as IUCN and local conservation partners.
Support NGOs and community groups involved in mangrove restoration, fisheries protection, and climate adaptation in Vietnam and the Lower Mekong.
Advocate for stronger groundwater regulation, sand-mining controls, and transboundary river management in the Mekong basin.

Make an Impact

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Verified Organizations

Organizations Helping(20)

Conservation International

In the Colombian Amazon, Conservation International implements climate adaptation programs for Indigenous communities, including early warning systems for droughts and floods, restoration of degraded areas to enhance water regulation, and capacity building for sustainable water management to address the transition from drought to flooding and hypertropical risks.

Donate Website →Source

Mekong River Commission (MRC)

The MRC addresses Mekong Delta wetland loss by producing basin-wide science, policy guidance and cooperative management tools that target flow, sediment and salinity issues affecting wetlands. It conducts basin hydrological and climate-change assessments, monitors salinity and dry-season flows, develops scenarios and modelling to inform national planners, and produces adaptation guidance (including options to manage salinity intrusion, floodplain management and sediment retention). It also convenes member governments through the Procedures and Technical Working Groups to coordinate water resources planning (including upstream dam impacts) and supports pilot activities and capacity building for climate-resilient agriculture and ecosystem management in the lower Mekong Basin.

Website →Source

WWF — Greater Mekong Programme

WWF tackles Mekong Delta wetland loss through integrated conservation and sustainable development programmes: they map and monitor wetlands and freshwater biodiversity, promote sustainable fisheries and aquaculture practices, pilot habitat restoration and mangrove reforestation to reduce coastal erosion and saltwater intrusion, and engage policy advocacy on hydropower planning and sediment management. WWF combines field projects with community-based livelihood alternatives (e.g., sustainable aquaculture, agroforestry), capacity building for local resource management, and regional policy work to influence transboundary river governance and dam planning that affect sediment flows to the Delta.

Website →Source

The Nature Conservancy (TNC) — Mekong Program

TNC addresses Mekong Delta wetland degradation by applying applied science, pilot restoration and nature-based solutions: they work on coastal wetland and mangrove restoration to buffer salinity and storms, design freshwater flow and sediment management interventions informed by hydrodynamic modelling, support sustainable fisheries and livelihood programs, and promote ‘nature-based infrastructure’ to complement engineered defenses. TNC also partners with governments and research institutions to integrate ecosystem-service valuation into planning and to pilot scalable restoration and community-based management models in Vietnam’s coastal provinces.

Website →Source