A journey to the source of the Indau
H.W. Lake’s 1894 account documents a systematic expedition up the Indau River in the Johor–Pahang border region, reaching the river’s source for the first time in recorded European exploration. The article combines travel narrative with topographical survey, geological observation, and ethnographic notes on the Jakun aborigines of the upper basin, producing a detailed itinerary that Lake explicitly intended as a guide for future travellers.
Summary
Lake departed from Kampong Padang on the Indau’s north bank on 13 August 1894, proceeding upstream in dug-out canoes (jalors) with a small Malay party. The lower Indau, averaging a third of a mile in width, was navigable by light-draught steamers as far as Kuala Sembrong, 30 miles from the coast. At the junction of the Indau and Indau Sembrong he noted a small group of granite hills (Bukit Tanah Abang and Bukit Langkap) bearing waterworn cassiterite grains in the clay overburden, and obtained the assistance of a Malay Batin of Jakuns to guide him further upstream (pp. 1–2).
At Batu Gajah, a Jakun village 22¼ miles above Kuala Sembrong, Lake established a camp while the Batin assembled a party of aborigines. He documented the settlement’s demographics (approximately one hundred men, women, and children in shared one-roomed huts), subsistence economy (tapioca root, fruits, fish, with rice, salt, and tobacco obtained from Malay traders in exchange for rotan, damar, getah, and camphor wood), and material culture (long spears but no blowpipes, unlike the Keratong and Jekati aborigines). He observed that the aboriginal tongue had become a mere dialect, at least two-thirds of its vocabulary being Malay or of Malay origin, though the community had not adopted Islam (pp. 2–3). A tiger attack on two Jakuns and a fatal injury from a bamboo spring-gun trap underscored the hazards of the upper river (pp. 3–4).
From 21 August, Lake proceeded with four Malays and fifteen Jakuns in a dozen canoes, navigating a succession of rapids (jerams) formed by outcropping quartz felsite and granite porphyry. The highest navigable point was reached on 23 August at approximately 37⅓ miles above Kuala Sembrong, beyond which the party continued on foot through a narrow rocky ravine. The actual source was identified on the eastern slope of a ridge at roughly 2,800 feet above sea level, connecting Gunong Besar (2,600 ft, fine-grained grey granite) with Gunong Chabang-tiga (three granite peaks, the highest estimated over 3,000 ft). The western slope of the same ridge drains into the Segamat River, a tributary of the Muar. Lake named this hill system the “Tenang range” and spent several days mapping the previously unexplored country before crossing into Ulu Segamat on 1 September (pp. 5–7).
Key Findings
- The Indau’s total length is approximately 75 miles: 44⅔ miles from source to Kuala Sembrong (general course easterly) plus 30 miles from Kuala Sembrong to the sea (course southerly) (p. 9).
- The source lies on a ridge at approximately 2,800 feet above sea level, with the Segamat River originating from the opposite (western) slope of the same divide, making the ridge a major drainage boundary between the Indau and Muar river systems (pp. 6–7).
- The geology of the upper Indau region consists of a granite bedrock overlaid by clays and clay shales, traversed by dykes of quartz felsite and quartz porphyry, with irregular intrusions of diorite, trachyte, and other felspathic rocks; the rapids are formed primarily by outcropping quartz felsite masses (p. 5).
- The Jakuns of the Upper Indau number approximately 100 at Batu Gajah and 130 at Sungei Mas; they are darker and smaller than Malays, with hair less tightly curled than that of the Orang Sakai, suggesting partial admixture (pp. 2–3).
- Fifteen distinct series of rapids occur between the Jasing River (29 miles) and the highest navigable point (37⅓ miles), all of granite and porphyry composition (p. 8).
- An old jungle path leads westward from a point about 30 miles above Mount Janing across the hills to the plain of Tenang in the Segamat district, a distance of one long day’s march for unloaded men (p. 6).
Conclusion
Lake’s definitive contribution is the first precise identification and mapping of the Indau’s source and the surrounding Tenang range, establishing the river’s total length and its hydrological relationship to the Segamat and Muar systems. His topographical data, compiled from aneroid barometer readings and field observations, filled a conspicuous gap in the survey of the Johor–Pahang interior and provided a practical itinerary for subsequent exploration of the Keratong and Jekati basins to the north.
Context
- The expedition was conducted under the jurisdiction of both the Sultan of Pahang (north bank) and the Sultan of Johor (south bank), with the police station at the Kuala flying the Pahang flag and the Naib’s residence at Kampong Padang representing Johor authority (p. 1).
- The article was published in the Journal of the Straits Branch of the Royal Asiatic Society, the principal vehicle for colonial-era geographical and ethnographical reporting in the Straits Settlements and Malay States.