In the past, the significance of Bangkok and Ayutthaya was due to their stratagic locations on the banks of the river. As ports of call fre quent ed by mer can tile ships from foreign lands, these two major towns prospered and bacame trading centers for international trade and com mu ni ca tions in addition to their status as the kingdoms capital cities.
From Ayutthaya and Bangkok, ships were built locally left with goods from Thai land to be sold overseas. In the old days, Thai junks like this used to be moored along the banks of the Chao Phraya River from the estuary in Samut Prakan Province all the way up to Bangkok. They gradually disappeared some 50 years ago.