Final answer:
Lisbon, the capital of Portugal, is where the Tagus River meets the Atlantic Ocean. The river estuary in Lisbon is significant for its historical maritime relevance.
Step-by-step explanation:
The city located where the Tagus River meets the Atlantic Ocean is Lisbon. Lisbon is the capital city of Portugal and has a rich history as a maritime city, which is evident in its strategic position along the river estuary. The Tagus River is the longest river in the Iberian Peninsula and its estuary at Lisbon forms the largest natural harbor in Western Europe, which has been instrumental in the historical maritime explorations initiated by Portugal during the Age of Discovery.
The city located where the Tagus River meets the Atlantic is Lisbon, the capital of Portugal. The Tagus River flows through the city and empties into the Atlantic Ocean. Lisbon is known for its stunning waterfront and historical landmarks, such as the Belém Tower and the Jerónimos Monastery.