Sinthay River originates from the Sinthay reservoir situated about 50km to the North of Naypidaw and flows pass a broad floodplain valley to eventually join the Sittaung River to the East of Naypidaw.
Sections of Segamat River in the town areas have been widened and levees raised during previous flood mitigation works.
High surface runoff from nearby housing developments near Sg. Choh in Selangor, Malaysia have resulted in a rapid increase in the volume of water carried by the river.