The Plentzia River, known as the Río Plentzia in Spanish, is located in the Basque Country of northern Spain. It flows through the town of Plentzia and empties into the Bay of Biscay. The river is approximately 10 kilometers long and is an important natural feature of the region, providing a habitat for various species of flora and fauna. The river's basin is characterized by lush greenery and scenic landscapes, making it a popular spot for outdoor activities such as hiking and fishing. The surrounding area is also rich in cultural history, with several historical sites and traditional Basque architecture nearby.