Where can southern stingrays be found?

stingrays can be found in grand cayman at stingray city near the barrier reef

your question is a little vague. The stingrays are a family of fish-Dasyatidae-of rays, cartilaginous fishes related to sharks. therefore different stingrays live in different parts of the world; However

They are common in coastal tropical and subtropical marine waters throughout the world, but the family also includes species found in warmer temperate oceans such as Dasyatis thetidis, and species entirely restricted to fresh water such as D. laosensis and Himantura chaophraya. With the exception of Pteroplatytrygon violacea.