Two cargo ships collided on the Chao Phraya River in Samut Prakan province on Tuesday morning.
The crash occurred about 11am, police said.
No crew members were injured.
The two ships were travelling in opposition directions.
The vessel O.P.K 3 was departing from Bangkok Port for Laem Chabang port. The NP Pathum Thani had come from Laem Chabang and was heading to Klong Toey port.
As the two boats passed in front of the provincial hall, the NP Pathum Thani crashed into the left side of the O.P.K 3, reports said.
The force of the collision left a hole in the O.P.K. 3's hull.
Marine police and officials removed 51 containers from the O.P.K 3. Buoys were placed around the ship to prevent an oil slick.
NP Pathum Thani was only slightly damaged. The owners of the two ships reported to police.
