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A ribu is a mountain that reaches a topographic prominence of at least 1,000 metres (3,281 ft). The term "ribu" derives from the Indonesian word "ribu" meaning "thousand", and reflects that to qualify as a ribu a peak must reach a prominence of at least one thousand meters.
In Indonesia, three categories of ribus are known according to the absolute height of the peak. The "Sangat Tinggi" (Indonesian for "very high") category is for peaks higher than 3000 meters, "Tinggi Sedang" (Indonesian for "medium height") for peaks between 2000 and 3000 meters, and "Kurang Tinggi" (Indonesian for "less high") for peaks with an elevation of between 1000 and 2000 meters. Currently, a total of 233 ribus are known across the Indonesian archipelago. Some are popular hikes, such as Mount Rinjani, Mount Semeru, and Mount Kerinci, while others are much more obscure, and some do not even have official names.
Some famous Indonesian mountains, such as Mount Bromo and Tangkuban Perahu, are not ribus because they are connected to higher peaks by high passes and therefore do not achieve enough topographic prominence. However, a subsidiary category of spesial (Indonesian for "special") peaks contains those deemed of such significant touristic interest that they merit inclusion, albeit subjectively, in a secondary list. At the moment, the Gunung Bagging website counts 74 Indonesian spesials.
- List of the Indonesian ribus and spesials
- List of peaks by prominence
- List of volcanoes in Indonesia
- Peak bagging
- John Rooke Corbett
- Ultra prominent peak
- List of the Indonesian ribus and spesials on the Gunung Bagging website
- Feature in the Jakarta Post (newspaper)
- Interview with list compiler Dan Quinn in the Jakarta Globe (newspaper)
- Article in the magazine of the ÖTK on the issue of ribu-bagging (German)
- The ribus of Europe (German)
- List of the ribus of Europe (German)