The 1866–1868 Mekong Expedition’s river-monster observations

Record summary

The Mekong Expedition led by Ernest Doudart de Lagrée and Francis Garnier generated detailed travel and natural-history observations, including local reports about large river animals and naga-associated waters. The expedition is a useful documentary anchor because its publications can be checked against maps, journals and contemporary illustrations. It does not constitute evidence for a single unidentified river monster; most observations belong to ordinary but poorly known regional fauna or local religious traditions. Researchers should isolate the exact passage and compare the expedition’s French wording with later English-language cryptid summaries.