The Dayaks are the indigenous people inhabiting Kalimantan beside the Kutais and the Banjars.
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Since the 1970s transmigration of people to East Kalimantan was organised by the Indonesian government especially in areas near River Mahakam.
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Transmigration aims to migrate people from overpopulated Java, Bali, and Madura islands to stimulate greater agricultural productivity in outer islands.
Among the few members of its family restricted to fresh water, the marbled whipray has been reported from Saigon in Vietnam, the Mekong River near Tonle Sap and Phnom Penh in Cambodia, the lower Nan and Chao Phraya Rivers in Thailand, and the Mahakam River in Kalimantan, Indonesia.
Other research studies include: Irrawaddy Dolphins in northern Borneo,Malayisia and Mahakam River and Lakes in East Kalimantan, Indonesia.
In 1966 HUFFCO signed production sharing contract with Pertamina to explore oil in the Kutai Basin of the Mahakam River delta in East Kalimantan, Indonesia.
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