Why is Chad described as a landlocked country?

Chad is described as a landlocked country because it is an independent sovereign state that lacks direct access to an ocean or to a sea that is not itself landlocked.12

Geographically, Chad is situated in north-central Africa and is entirely surrounded by other nations: Libya to the north, Sudan to the east, the Central African Republic to the south, and Cameroon, Nigeria, and Niger to the west. Because of this interior location, the capital city, N’Djamena, is located nearly 1,000 miles (1,600 km) away from the nearest coastal ports.32