Sumatra is known for wet-hulled (giling basah) arabica that often shows a smooth, sweet body with cocoa and earth notes, plus a big robusta crop in the south.
Sumatra is Indonesia's westernmost island. Its arabica comes from a large number of smallholder producers and is distinguished by the *giling basah* ("wet hulling") technique: farmers pulp the cherries, store the mucilage-coated beans for up to a day, wash off the mucilage and dry the coffee only partially before hulling it in a semi-wet state, which gives the beans a distinctive bluish colour. The process reduces acidity and increases body. Sumatran coffees are known for a smooth, sweet body that is balanced and intense, and depending on the region, notes of cocoa, tobacco, smoke, earth and cedar can show well in the cup. Occasionally they show greater acidity, with tropical fruit, grapefruit or lime notes.
The island's named arabica areas include the Gayo highlands in Aceh, Lintong and the Lake Toba area, and the Mandheling trade name from northern Sumatra. Lampung, South Sumatra and Bengkulu in the south make Sumatra the largest robusta producer.
Field notes
- i
Sumatran green beans often have a distinctive bluish colour, which is attributed to the processing method and a lack of iron in the soil.
In the cup, according to guides
- BodyMoreSumatran coffees are known for a smooth, sweet body that is balanced and intense, and wet hulling increases body.
- AcidityLessWet hulling reduces acidity, though Sumatran coffees can occasionally show greater acidity with tropical fruit, grapefruit or lime notes.
- EarthyOften notedNotes of cocoa, tobacco, smoke, earth and cedar wood can show well in the cup.
Within Sumatra
Processing
Elsewhere in Indonesia
Sources · 1 Every sentence here was checked against a source we read. Taste notes are what guides describe, not promises about your bag. Last revised 2026-11-10.
- Coffee production indonesia — Wikipedia · Wikipedia