The Mekong Is Sinking Faster Than the Sea Rises

Sand mining makes the Mekong Delta sink up to 6 cm a year — fifteen times faster than the sea rises.

The world extracts 50 billion tonnes of sand and gravel annually [1]. After water, it’s the most extracted material on the planet [2]. Demand has tripled in two decades and grows about 6 percent per year [3], fed by concrete, glass, and asphalt — the bones of every city.

What we’re pulling this material from matters. River deltas, coastlines, barrier beaches — the natural infrastructure that absorbs storm surges and buffers rising seas — is being strip-mined to build the infrastructure sitting behind it. Burning the life raft for firewood.

The Mekong Delta makes this clear. Sand mining drives land subsidence of 2 to 6 cm per year there [4]. Global sea level rise is running at roughly 3 to 4 mm per year [5]. Twenty million people live on that delta. Upstream in Cambodia, the same extraction has cut wet-season flows into Tonle Sap Lake in half between 1998 and 2018 [6], starving Southeast Asia’s largest freshwater fishery.

None of this is breaking news. Journalist Vince Beiser laid out the full picture in The World in a Grain back in 2018 [7]. The problem is that nobody with power wanted to read it.

The illegal sand trade is worth $200 to $350 billion per year [8]. In India alone, sand mafias killed three police officers in May and June of 2024, crushing them with tractor-trolleys during enforcement raids [9]. In Morocco, about half the sand used in construction comes from illegal coastal mining [10]; dune systems between Rabat and Casablanca have been scraped down to rock.

Governments are scrambling, but mostly to protect their own coastlines. Indonesia banned sand exports in 2007, severing more than 90 percent of Singapore’s supply [11]. Malaysia imposed a sea sand ban in 2018 [12]. Cambodia followed [13]. Singapore — the world’s largest sand importer at 517 million tonnes over two decades [14], having grown its landmass by over 20 percent since the 1960s [15] — is now pivoting to polder-style reclamation, cutting sand demand by roughly 40 percent [16].

The appetite for concrete hasn’t slowed. China poured 6.6 gigatons of cement between 2011 and 2013, more than the United States used in the entire twentieth century [17]. The $13 billion New Manila International Airport has been pushed to 2028 because contractors can’t source enough fill sand [18].

On May 13, UNEP launches its third Sand and Sustainability report at the Palais des Nations in Geneva [19]. The first one came out in 2019. Extraction has only climbed since.

We’re dismantling the geography that shields us from the water. The deltas sink, the coastline recedes, and we act like it’s a mystery why the floods keep getting worse.

References

[1] Damian Carrington, “50bn tonnes of sand and gravel extracted each year, finds UN study,” The Guardian, 2022 — https://www.theguardian.com/environment/2022/apr/26/50bn-tonnes-of-sand-and-gravel-extracted-each-year-finds-un-study

[2] UN News, “Use sand resources ‘wisely’ or risk development fallout – UNEP report,” 2022 — https://news.un.org/en/story/2022/04/1116972

[3] UNEP, “The problem with our dwindling sand reserves,” 2022 — https://www.unep.org/news-and-stories/story/problem-our-dwindling-sand-reserves

[4] E.A. Koster et al., “Practical paths to halt elevation loss in Vietnamese Mekong Delta,” One Earth, 2025 — https://www.sciencedirect.com/science/article/pii/S2666683925000744

[5] “Sea level rise,” Wikipedia — https://en.wikipedia.org/wiki/Sea_level_rise

[6] Mike Gaworecki, “Mekong sand mining risks collapse of SE Asia’s largest freshwater lake, study finds,” Mongabay, 2025 — https://news.mongabay.com/2025/12/mekong-sand-mining-risks-collapse-of-se-asias-largest-freshwater-lake-study-finds/

[7] Lulu Garcia-Navarro, “The Story Of Sand In ‘The World In A Grain,’” NPR, 2018 — https://www.npr.org/2018/08/05/635748605/the-story-of-sand-in-the-world-in-a-grain

[8] Luis Fernando Ramadon, “The global estimated value of illegal sand extraction,” SandStories.org, 2024 — https://www.sandstories.org/stories/estimated-annual-value-illegal-sand-extraction-lfr

[9] South Asia Network on Dams, Rivers and People, “May-June 2024: Sand Mafias Mowed Three Policemen to Death,” 2024 — https://sandrp.in/2024/06/30/may-june-2024-sand-mafias-mowed-three-policemen-to-death/

[10] ISS Africa, “Illegal sand mining threatens Morocco’s coastline and tourism,” ISS Today, 2021 — https://issafrica.org/iss-today/illegal-sand-mining-threatens-moroccos-coastline-and-tourism

[11] National Library Board Singapore, “Indonesia bans land sand exports to Singapore,” 2007 — https://www.nlb.gov.sg/main/article-detail?cmsuuid=5c6485bb-c357-48be-9d12-bf7c1d422d0e

[12] Reuters, “In blow to Singapore’s expansion, Malaysia bans sea sand exports,” 2019 — https://www.reuters.com/article/world/exclusive-in-blow-to-singapores-expansion-malaysia-bans-sea-sand-exports-idUSKCN1TY0DD/

[13] BBC, “Cambodia bans sand exports permanently,” 2017 — https://www.bbc.com/news/business-40590695

[14] Greenfacts, “Box: The cases of Dubai & Singapore,” UNEP Sand Extraction report, 2019 — https://www.greenfacts.org/en/sand-extraction/figtableboxes/1.htm

[15] Singapore Government (SG101), “Sand,” 2024 — https://www.sg101.gov.sg/environment/case-studies/sand/

[16] Beneath the Sands / Environmental Reporting Collective, “Reclamation: A Flawed Solution,” 2023 — https://www.beneaththesands.earth/reclamation

[17] Niall McCarthy, “China Used More Concrete In 3 Years Than The U.S. Used In The Entire 20th Century,” Forbes, 2014 — https://www.forbes.com/sites/niallmccarthy/2014/12/05/china-used-more-concrete-in-3-years-than-the-u-s-used-in-the-entire-20th-century-infographic/

[18] Philstar/Interaksyon, “Bulacan airport completion delayed to 2028 due to construction worries,” 2024 — https://interaksyon.philstar.com/politics-issues/2024/08/27/282344/bulacan-airport-completion-delayed-to-2028-due-to-construction-worries/

[19] Coastal Care, “3rd Sand and Sustainability report – UNEP | Grid-Geneva,” 2026 — https://coastalcare.org/2026/04/upcoming-launch-3rd-sand-and-sustainability-report-unep-grid-geneva/