Nine Square Pavilion or popularly known as Chaloem Phrakiat Aquarium in the shape of a nine-pointed star, thrust into Bueng Si Fai. The interior contains more than 20 species of fish tanks and the fish species are switched regularly. In addition, in the center of the building, there is also an opening for viewing fish in the Si Fai Pond which has different types of fish gathered in large numbers to wait for the food that the tourists scattered to eat Chaloem Phrakiat Aquarium: It is under the supervision of the Phichit Inland Fisheries Research and Development Center.