Final answer:
Ecuador, Colombia, and Brazil have the equator passing through them in South America.
Step-by-step explanation:
Three countries in South America that have the equator passing through them are Ecuador, Colombia, and Brazil. The equator, which is an imaginary line that divides the Earth into the northern and southern hemispheres, runs through these countries. Ecuador is actually named after the equator, as it lies directly on it. Colombia and Brazil also have parts of their territories crossed by the equator.