Police in Quang Binh Province on Friday seized 1.4 tons of wild turtle from a single automobile.
Nguyen Van He, 33, was driving a car stuffed with sacks of turtles. He, a local, had Laotian liscense plates, police said.
The turles' origins and destination have not been released.
Quang Binh environmental police said the case was the biggest turtle trafficking crime in the province's history.
Authorities are investigating the case further and considering ways to return the animals to their natural environment.