The Pivka River is a river located in southwestern Slovenia. It is approximately 27 kilometers long and flows through the Pivka Valley, eventually joining the Rijeka River. The river is known for its unique karst features and is an important part of the local ecosystem. The Pivka River is characterized by its intermittent flow, often drying up in summer months. It is also notable for its rich biodiversity, including various fish species and aquatic plants. The river's surroundings are popular for outdoor activities such as hiking and birdwatching, attracting both locals and tourists.