This study describes the ocean circulation of the Indonesian Seas based on results using a 3D regional model. The study is divided into 3 parts. In the first part, Chapter 2, the basic properties of a developed regional model of the circulation of the Indonesian Seas are outlined. It is well known that the complex topography of the region strongly influences temperature, salinity and current distributions there. The main objective of the second part, Chapter 3, is to analyze the basic features of potential temperature and salinity distributions in the Indonesian Seas simulated by the model....