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The border of the Kingdom of Siam (Thailand) and its internal administrative districts are highlighted in yellow. Inset maps show the cities of Bangkok, Chiengmai (Chiang Mai) and Luang Pra Bang (Luang Prabang) in more detail.

Map of the province of Soc Trang (Sóc Trăng, Vietnam) on the bank of the Bassac River, southern Vietnam. The city of Soc Trang is in the centre, surrounded by rivers, roads, fields and villages.

Map of the district of Saigon (Ho Chi Minh City, Vietnam), based around the Fleuve Soirap (Soài Rạp River) as it winds its way down to the South China Sea. The city of Saigon is on its banks, surrounded by more rivers, roads, fields and villages.

Map of the district of Gocong (Gò Công, Vietnam), near the mouth of the Mekong River. The town of Gocong is in the centre, surrounded by rivers, canals, fields and villages.

Two-sheet map of the district of Bien-Hoa (Biên Hòa) east of Ho Chi Minh City, Vietnam. The area is dominated by rivers, wetlands and mangroves. Labels describe the terrain e.g. ‘Bois marécageux avec rivières [Swampy woods with rivers]’.

A map to aid in the navigation of the rivers leading to Saigon (Ho Chi Minh City, Vietnam). Details include bathymetry (water depth), currents, and a side view (or ‘elevation’) of hills to use as a landmark. Tides are described in written remarks.