What 2 countries are located entirely within 0 degrees and 10 degrees north latitude 50 degrees and 60 degrees west longitude?

The correct answer is - Suriname and Guyana.

Suriname and Guyana are the two countries that are located entirely within the given northern latitudinal and western longitudinal degrees. They are both on the South American continent, in its northeastern part, just north of Brazil, and just south of Venezuela.