Saltwater clams can be found on both the Atlantic and Pacific coasts of South America. Many people consider the best are these Chilean machas clams displayed at an outdoor fish market in Puerto Montt. The almejas are a wonderful main ingredient for Chilean cuisine. They are harvested by “hookah” divers who use breathing lines to reach the clam beds. Southern Chile also has a freshwater species of clams found in rivers called diplodon chilensis.