This Survey Map Of The Straits Of Singapore, is respectfully inscribed to The Honourable Colonel Butterworth, C.B.
Surveyed with Captain Samuel Congalton of the steamer, Diana. Thomson’s hydrographic survey was the first detailed hydrographic survey to be conducted by a locally based surveyor. This is one of the most important and detailed early hydrographic maps of the Singapore Strait
Map shows data on depths of water, physical landscape, settlement, forests, hills, rivers, Singapore town, Singapore district boundaries of Bukit Timah, Toah Pyoh Lye, Toah Pyoh (Toa Payoh), Amokiah (Ang Mo Kio), Pyah Laebar (Paya Lebar), Changee (Changi), Tulloh Mati Ikan, Tamah Merah Ketchil (Tanah Merah Kechil), Siglap, Gaylang (Geylang), Kallang, Rochor, Tanglin, Claymore, Tanjong Pagar, Tulloh Blangan (Telok Blangah), Pulo Pisang, Pulo Cocob, part of Southern Johor, Pulo Soodong (Pulau Sudong), Mangrove Island (Pulo Simakow or Pulau Semakau), Alligator Islands, Barn Island, Rabbit Island, Pulo Sikra, Pulo Ayer Limau, Pulo Bookum (Pulau Bukom), Tree Island (Pulo Angup), Sultan Shoal, Raffles Lighthouse, Salat Sinki, Phillips Channels, Main Strait, Batam Bay, and surroundings
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