The Tagus River City is the Spanish city of Toledo, which is located in the autonomous community of Castilla-La Mancha. It is situated on a mountaintop overlooking the Tagus River and is known for its rich cultural and architectural heritage. Toledo has been declared a World Heritage Site by UNESCO and is one of the most visited cities in Spain. It is also home to many important monuments, including the Alcázar, the Cathedral of Toledo, and the Church of Santo Tome.