The earliest mention of these seafaring nomads comes from a book by a Chinese traveller to Singapore in the 14th Century, hundreds of years before the arrival of the British in 1819. Singapore"s Orang Laut tribes include the Orang Seletar who lived in the mangroves near the Seletar River; the Orang Biduanda Kallang from the Kallang River; the Orang Gelam at the mouth of the Singapore River; and the Orang Selat from the Southern Islands. There are also other Orang Laut communities living on houseboats at sea in southern Peninsular Malaysia and Indonesia"s Riau Islands.