Coffee that tastes like the volcano it grows on. Chemists can identify Bolaven Plateau beans by the unique mineral fingerprint in their aroma.
Thomas Schoch, CC BY-SA 3.0, via Wikimedia Commons
A Landscape Forged by Fire
The Bolaven Plateau is a massive, saucer-shaped basaltic extrusion in southern Laos. Millions of years of volcanic activity blanketed the region in thick layers of basalt, creating a high-elevation plain between 1,000 and 1,350 meters above sea level. This volcanic field, covering roughly 6,000 square kilometers, sits atop Mesozoic-era sandstones and mudstones. The last 16 million years have seen episodic eruptions, laying down basalt flows that are in some places up to 300 meters thick.
This geological history shapes the coffee's chemistry. Over eons, the basaltic rock weathered into a deep red loamy soil. This volcanic earth is exceptionally fertile, containing high concentrations of minerals like phosphorus and potassium. Coffee plants extend their roots deep into this soil, absorbing the minerals that contribute to the final flavor profile of the beans. The soil's composition, a direct result of ancient lava flows, provides the foundation for the coffee's unique taste.
The Chemistry of Climate
The plateau's altitude and climate are as important as its soil. The elevation ensures a cool, misty climate with an average temperature around 20°C (68°F). This differs from the tropical heat of the surrounding lowlands. These cooler temperatures slow the maturation of the coffee cherries. This extended ripening period allows for a greater concentration of sugars and aromatic compounds to develop within the bean.
The region receives more than 4,000 mm (160 inches) of annual rainfall, the heaviest in Laos, primarily from the southwest monsoon between May and October. This ample moisture is important for coffee cultivation, particularly for the delicate Arabica species. The combination of high altitude, rainfall, and mineral-rich volcanic soil creates the specific terroir responsible for Bolaven Plateau coffee. About 95% of Laos's coffee is harvested from this specific region.
French colonists first introduced coffee to Laos around 1915, initially planting Arabica varieties like Typica and Bourbon in the early 1920s. Today, both Arabica and Robusta are grown, with Arabica beans known for their mild citrus and floral tones, and Robusta prized for its strength. Laos produces about 20,000 tons of coffee annually, with 15,000 tons of Robusta and 5,000 tons of Arabica. The hand-harvesting methods used by local farmers ensure the high quality of the beans.
💡Fun Facts
The Bolaven Plateau's volcanic field may bury the 790,000-year-old impact crater that created the Australasian tektite strewn field.
French colonists established a coffee research center near the town of Paksong in 1930 to develop the region's production.
Some local farmers use the tall Liberica coffee species, which can grow up to 18 meters high, as living fences for their plantations.
A popular local drink is "café nom yen," an iced coffee sweetened with condensed milk.
Plantations and cafes in towns like Paksong generally operate during daytime hours, typically from 8:00 AM to 5:00 PM. Tours can be arranged directly with specific farms.
Admission
Access to the plateau is free. Individual coffee plantation tours and tastings may have associated fees.
Accessibility
The main roads on the plateau are paved, but exploring plantations will require navigating uneven, unpaved farm roads and dirt paths.
