Which one of the following countries is land locked?

Among the four choices, Bolivia is the landlocked country. Authoritative sources note that South America has only two landlocked states—Bolivia and Paraguay—and that Bolivia lost its Pacific coastline in the 19th-century War of the Pacific, leaving it without direct ocean access. By contrast, the other options have maritime access: Peru borders the Pacific Ocean, Suriname lies on the northern (Atlantic) coast of South America, and Uruguay fronts the South Atlantic via the Río de la Plata estuary and Atlantic seaboard [1]. Therefore, Bolivia (option 1) is the only landlocked country listed.

Sources

1. [1] FUNDAMENTALS OF HUMAN GEOGRAPHY, CLASS XII (NCERT 2025 ed.) > Chapter 7: Transport and Communication > The Southern Atlantic Sea Route > p. 62