Same River, Different Footprint: Mondulkiri's Water Use in the Srepok Watershed Compared With Vietnam's Irrigated Highlands

Water rarely gets the same attention as soil or altitude in coffee origin stories, but it is arguably a harder constraint. A coffee tree can survive on modest soil and imperfect elevation. It cannot survive a mismanaged dry season. The Srepok River, which rises in Vietnam's Central Highlands and flows through Mondulkiri before joining Cambodia's Mekong system, offers an unusually direct way to compare how two coffee-growing regions on the same watershed have used — and stressed — the same water resource.

One watershed, two coffee economies

The Srepok River Watershed spans the Cambodia–Vietnam border, draining a large area of Vietnam's Dak Lak province before crossing into Cambodia through Ratanakiri and Mondulkiri. On the Vietnamese side, this watershed sits underneath one of the highest concentrations of coffee cultivation on earth. On the Cambodian side, the same watershed supports a small, still-developing coffee sector alongside forest, rubber, and mixed smallholder agriculture.

This shared geography makes the Srepok a useful natural experiment: the underlying river system is the same, but what has been built on top of it differs enormously.

Documented water stress on the Vietnamese side

The water demands of Vietnam's coffee boom in this watershed have drawn direct research attention from international conservation organizations. WWF's Water Stewardship Program has specifically commissioned baseline research into the water footprint of coffee production and water risk in the Srepok River, reflecting real concern about the sustainability of current usage patterns. Separately, academic hydrological modeling of the Srepok River Watershed, published in 2025, identified coffee irrigation as the primary cause of unmet water demand in the middle of the watershed during the second half of the dry season — ahead of other annual crops grown in the same basin. The same research found that switching from hose to sprinkler irrigation could meaningfully reduce that gap, indicating the current shortfall is tied to how intensively and how inefficiently coffee is being irrigated at scale.

This is not a minor technical footnote. It means one of the world's most important coffee-growing regions is operating with a water demand that its own watershed studies describe as exceeding reliable dry-season supply in parts of the basin.

A smaller, less irrigation-dependent footprint in Mondulkiri

Cambodia's coffee sector sits on the same river system but at a radically smaller scale, and has not built the same dependence on intensive dry-season irrigation. Mondulkiri's coffee area remains in the low hundreds of hectares, grown predominantly by smallholders rather than large irrigated estates. That said, water access is still a real constraint for Cambodian growers — farmers in the province have specifically cited water availability, not land, as their main barrier to expanding production, and some producers depend on manual watering during dry periods rather than installed irrigation systems.

The honest comparison is therefore not that Cambodia has solved water scarcity while Vietnam has not. It is that Cambodia's coffee sector, being far smaller, has not yet placed the same aggregate demand on the shared watershed — while Vietnam's mature, large-scale plantation system has grown to the point where independent research now documents a structural water deficit during the dry season.

Why this matters for how Cambodia should grow

This comparison is less a finished advantage than an open strategic choice. As Cambodia's coffee sector expands, it can either replicate Vietnam's high-intensity, irrigation-dependent plantation model, or develop toward water-efficient practices — rain-fed farming where feasible, efficient irrigation technology where not, and agroforestry-supported moisture retention — before the same dry-season pressure documented in Vietnam becomes a Cambodian problem too. Cambodia's current small scale is an opportunity to make that choice deliberately, rather than a permanent structural advantage that requires no further action.

Watershed comparison at a glance

What buyers and partners should ask

Water risk is increasingly part of how sustainability-minded buyers evaluate an origin, alongside deforestation and labor practices. For Cambodian coffee specifically, the useful question is forward-looking: what irrigation and water-management practices are being adopted as the sector scales, not just what the current footprint looks like today while volumes remain small.

Frequently asked questions

Does Mondulkiri coffee use the same river system as Vietnam's coffee industry?

Yes. The Srepok River flows from Vietnam's Central Highlands, including Dak Lak province, into Cambodia through Ratanakiri and Mondulkiri.

Has Vietnam's coffee industry caused documented water problems in this watershed?

Peer-reviewed hydrological research on the Srepok River Watershed has identified coffee irrigation as the leading cause of unmet water demand during the dry season in parts of the basin, and WWF has commissioned dedicated research into the water footprint of coffee production there.

Does Cambodia have a water advantage because its coffee sector is smaller?

In terms of aggregate demand on the watershed, yes for now — but Cambodian farmers still report water access as a real constraint on their own production, particularly during dry periods.

Will Cambodia inevitably face the same water stress as Vietnam if its coffee sector grows?

Not necessarily, but it depends on the irrigation and land-management choices made as the sector scales. Replicating Vietnam's high-intensity irrigation model at large scale could eventually create similar pressure.

What should buyers ask about water use when sourcing Cambodian coffee?

What irrigation methods are used, whether farms rely on rain-fed cultivation or installed systems, and how water use is expected to change as production expands.

OCC takeaway

Mondulkiri sits downstream on the same river system that has produced documented, research-verified water stress on Vietnam's side of the Central Highlands coffee boom — but has not yet built the same scale of irrigation dependence. That gives Cambodia's coffee sector a real chance to grow deliberately around water efficiency, rather than an advantage it can simply claim by default.

2026 Cambodian Coffee discovery context for US readers

Mondulkiri is an origin question, not just a place-name keyword. Readers want to know where coffee is grown, how the landscape and farm system affect the lot, who handles the coffee after harvest, and what makes one lot different from another.

What makes a Mondulkiri coffee claim credible?

• The exact origin level is stated clearly.
• Climate, elevation, soil, or farming claims are separated from measured lot results.
• Harvest timing and cherry maturity are documented.
• Processing and drying are disclosed rather than treated as invisible steps.
• Sensory differences are supported by a repeatable sample or cupping record.

The useful bridge is place → process → evidence → repeatable cup → buyer fit. A province name should not automatically imply Fine Robusta quality.

OCC routing

Use the relevant owner page for the next step: Cambodia origin and coffee discovery, Mondulkiri coffee, Fine Robusta Cambodia, Roasting Program, or Wholesale Coffee Supply. Supporting articles should answer one question clearly and pass authority to the owner.

Quick answer

Mondulkiri sits on the same Srepok River watershed that hydrological research has linked to documented dry-season water stress from Vietnam's large-scale coffee irrigation, but Cambodia's much smaller, largely rain-fed coffee sector has not yet built the same water footprint — an opening to grow more water-efficiently rather than a guaranteed advantage.