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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 district of Longxuyen (Long Xuyên in the Mekong Delta, Vietnam). The city of Long Xuyên is on the southern bank of the Bassac River (labelled ‘Fleuve Postérieur’ and ‘Fleuve Antérieur’), surrounded by rivers, wetlands, 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.

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.