The crossword solution for the term 'South of Mexico' is SUR, which is the two-letter ISO 3166-1 alpha-2 code for Suriname. Suriname is a country located on the northeastern Atlantic coast of South America, bordered by Guyana to the west, Brazil to the south, and French Guiana to the east. It is the smallest sovereign state in terms of area and population in South America. The country is situated just south of Mexico, making it the southernmost country in the Americas.