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Chart of the Singapore Strait, Riau Archipelago and Lingga Islands, marked with bathymetry (sea depth), side views of landmark mountains (elevations), written notes, and islands, shoals and reefs, all to aid navigation.

To aid navigation, this map shows small islands, shoals and reefs, maritime routes for use during monsoons or at particular times of the year, bathymetry (sea depth), past explorers’ routes, shipwrecks and text about monsoons, typhoons and currents.

Chart of the Singapore Strait, Riau Archipelago and Lingga Islands, marked with bathymetry (sea depth), side views of landmark mountains (elevations), written notes, and islands, shoals and reefs, all to aid navigation.

The inset map on this map of India features part of mainland Southeast Asia: Pegu and the Tenasserim Provinces (Myanmar), Siam (Thailand), and the Malay Peninsula (Malaysia), with the Straits Settlements—Singapore, Malacca, Penang—highlighted in red.

The inset map on this map of India features part of mainland Southeast Asia, with the British colonial territories—Straits Settlements, British Burma—highlighted in red, ‘protected states’ in yellow, and ‘independent states’ in green.