Nakhon Phanom Deputy Governor Damrong Siriwichai-Imwiset, Vice Admiral Pisit Thongdeelert, commander of Mekong Peacekeeping Command, and the province’s deputy police chief, Pol Col Paladej Phetcharawango, told reporters about the operation on Wednesday.
Acting on a tip-off, officials staked out a location along the Mekong River opposite Laos in Ban Sai Mool, That Phanom district.
Three men arrived in a long-tailed boat and unloaded bags onto the riverbank.
When the pickup arrived at 9.20pm, the team advanced, but the suspects fled in the dark, leaving behind the shipment and the truck bearing a Bangkok licence plate.
On the riverbank were nine bags containing 448 bricks of compressed marijuana, weighing 466 kilograms in total.
Authorities believe the ganja was top grade because of the neat packaging.