Khok Mai Den Ancient City is in Tambon Tha Nam Oi. The city is quite expansive. Traces of the old city wall remain and an artifact in the form of a sculpture of the elephant Phaya Chatthan was discovered here. It is over 1,000 years old. The word Khok Mai Den refers to a kind of tree. People in the old days called Ban Khok Mai Den Muang Bon. The city was founded in the Thawarawadi period around 11th-16th Buddhist centuries (457-957 AD). The city is similar to Nakhon Pathom and is around 250 meters long and 600 meters wide. It is very much alike the city wall of Nakhon Pathom, Muang Sema of Nakhon Ratchasima and Muang Phaya Rae of Chon Buri.
Getting There : The city is 32 kilometers from the city on the Nakhon Sawan-Bangkok route (Asian Highway), then turn left into Khok Mai Den for 3 kilometers.