Haiti, officially the Republic of Haiti, is a sovereign nation located on the western portion of the island of Hispaniola in the Caribbean Sea. It shares a border with the Dominican Republic to the east and is situated in the Caribbean subregion of the Americas. With an estimated population of 11.4 million people, Haiti is the most populous country in the Caribbean. The country's capital and largest urban center is Port-au-Prince. Historically, Haiti has played a pivotal role in the history of the Americas, notably as the site of the only successful slave revolt leading to an independent state.