This mid-19th century map by Edward Weller provides a detailed geographical depiction of Mainland Southeast Asia, encompassing modern-day Myanmar (Burmah), Thailand (Siam), Vietnam (Annam and Tonquin), Cambodia, and the Malay Peninsula, as well as the Andaman and Nicobar Islands in the Indian Ocean. Published in London, the map highlights the complex political landscape of the era, demarcating British colonial possessions in Lower Burma and Malaya alongside regional empires, tributary Shan States, and coastal sultanates. Key river systems, such as the Irrawaddy, Chao Phraya, and Mekong, are drawn with notable accuracy alongside relief shading for mountain ranges and detailed coastal soundings. Major ports and historical capitals, including Rangoon, Bangkok, Hué, Saigon, and Singapore, are clearly marked, illustrating the growing commercial and geopolitical significance of the region during the Victorian era. Finely engraved and embellished with subtle original hand coloring, this work stands as a classic example of British commercial cartography from the peak of 19th-century imperial mapping.