Port Louis is the capital of Mauritius. It is located on the western coast of the island and is the largest city in the country. Port Louis is a major economic, cultural, and political center in Mauritius. It is known for its vibrant markets, colonial architecture, and historical sites. The city is also a popular tourist destination, with attractions such as the Aapravasi Ghat, the Central Market, and the Caudan Waterfront. Port Louis plays a crucial role in the administration and governance of Mauritius, making it the correct answer to the question.