The two continents that are entirely located in the western hemisphere are North America and South America. Both continents lie to the west of the Prime Meridian, which is the dividing line for the eastern and western hemispheres.
North America encompasses countries such as the United States, Canada, and Mexico, while South America includes nations like Brazil, Argentina, and Colombia. The western hemisphere is defined as the half of the Earth that lies to the west of the Prime Meridian and to the east of the International Date Line. This geographical division is important for understanding various cultural, social, and political contexts that are specific to these continents.