Final answer:
Child labor is most significant in southeast Asia, with heavy concentrations of child laborers also present in sub-Saharan Africa and central and southern Asia.
Step-by-step explanation:
Child labor is most prominent in southeast Asia, with the region facing challenging issues surrounding the exploitation of child labor. According to the provided information, over 86 million children involved in labor live in sub-Saharan Africa, while central and southern Asia are home to over 26 million child laborers. Legislation and compulsory education have made significant impacts in reducing child labor in more economically developed regions, but it continues to be a pressing issue in less economically developed areas around the world.