In 1910, French Equatorial Africa (''Afrique équatoriale française'', AEF) was created, and French companies were allowed to exploit the Middle Congo (modern-day Congo-Brazzaville). It soon became necessary to build a railroad that would connect Brazzaville, the terminus of the river navigation on the Congo River and the Ubangui River, with the Atlantic coast. As rapids make it impossible to navigate on the Congo River past Brazzaville, and the coastal railroad terminus site had to allow for the construction of a deep-sea port, authorities chose the site of Ponta Negra instead of Libreville as originally envisaged. Construction of the Congo–Ocean Railway began in 1921, and Libreville was surpassed by the rapid growth of Pointe-Noire, farther down the coast. 