The incident occurred at around 12 pm. The columns of smoke from the fire rose hundreds of metres to blanket Road 843 and a nearby residential area with around 100 households.
The fire at Tram Chim National Park
Roughly 200 people were mobilised to fight against the fire, including many local residents.
According to a representative from the national park, firefighters were trying to bring the fire under control.
No casualties have been recorded, but some properties belonging to local people have been damaged, he added.
The fire spread from grasslands to newrby cajeput trees.
Tram Chim National Park covering an area of 7,500 hectares is home to many precious bird species, especially the Sarus Crane.