The city located at the mouth of the River Thames is London, the capital of the United Kingdom. The Thames River, which flows through southern England, has played a crucial role in the historical, economic, and cultural development of London since Roman times. The river serves as a vital transportation route and has shaped urban planning and commerce in the city. Key landmarks, such as the Tower Bridge and the London Eye, can be found along its banks, making the Thames not only a geographical feature but also a significant part of London's identity.