Over 25,000 islands sit between two great oceans
The Malay Archipelago—also Insulindia or the Indo-Australian Archipelago—spans the waters between Mainland Southeast Asia and Australia. With more than 25,000 islands it is the world’s largest archipelago by area and fifth by island count, tying Brunei through Singapore into one maritime belt.
Alfred Wallace popularised the label in his nineteenth-century natural-history book, sometimes calling the same waters the Indian or Indo-Australian Archipelago and even folding in the Solomon Islands and Malay Peninsula on physiographic grounds. Older Arabic charts spoke of a Java Archipelago; colonial Europe long said East Indies. Nusantara appears in the 1255 Mula Malurung inscription and again in Gajah Mada’s Palapa oath, while Classical Malay prose of 1612 still uses the word.
Land and sea together exceed two million square kilometres. Indonesia’s big clusters take in Maluku, New Guinea, and the Sundas—split into Greater and Lesser belts—while the Philippine side centres on Luzon, Mindanao, and the Visayas. Ranked by size, the seven giants are New Guinea, Borneo, Sumatra, Sulawesi, and Java plus Luzon and Mindanao. Equatorial climate rules the belt, yet the geology is fiercely volcanic, especially on Java, Sumatra, and the Lesser Sundas, where many peaks top three thousand metres.
Mount Kinabalu in Sabah reaches 4,095.2 metres; Puncak Jaya on Papua climbs higher still. The outdated European idea of a “Malay race” that named the region remains contested in Indonesia, yet “Maritime Southeast Asia” remains a near synonym. Puncak Mandala at 4,760 metres and Puncak Trikora at 4,750 metres, both in Indonesia, fill out the list of giants. Wallace also drew the line that now bears his name, separating Asian from Australian plants and animals along the deep channel between Borneo and Sulawesi and south through the Lombok Strait that parts Bali from Lombok. East of it lies Wallacea, a transition zone where species from both continents mingle alongside ones found nowhere else.
Source: Malay Archipelago
