The Tinto River is located in the Huelva province of Spain. It is known for its striking red color, which is caused by high levels of iron and other minerals in the water. The river flows for about 100 kilometers and has been shaped by centuries of mining activities in the region. The river's unique ecosystem supports various forms of life, including extremophiles, which thrive in its acidic waters. The Tinto River is also significant for its historical importance, as it has been used for mining since ancient times, contributing to the area's rich cultural heritage.