The national park issued a statement on Sunday saying the four attractions that have been closed include the Naga and Nagee caves and Tat Wiman Thip and Kinnaree waterfalls. Access to these four sites will be reopened from June 1.
The national park said the area is closed every year to allow the ecosystem to recover as well as improve facilities to support tourists.
Once the areas reopen, tourists can book a visit to the Naga Cave via the QueQ application, though reservations are not required for the other three sites.
The national park, which straddles Nakhon Phanom and Bueng Kan provinces, also said it is collaborating with the Surasakmontri military unit and provincial medical agencies to be on standby for emergencies.
The statement also urged visitors to avoid leaving garbage behind and not removing anything from the area.
The Phu Lanka National Park was ordered closed in September 2020 when the recently discovered Naga cave, which features unique formations like giant snake scales, was defaced by people looking for lucky lottery numbers and vandals.