Its sources are in the karst upland of Pandivere, in north-eastern Estonia, and its main tributaries join the river from the upland of Sakala. Due to its length, the river Pärnu passes through most of the landscape types found in Estonia.
The sources of this river are in the karst upland of Pandivere, north-eastern Estonia, and its major tributaries join it from the upland of Sakala. Due to its extensive length, the Pärnu River passes through a variety of Estonian landscapes.