Called "nam bplah" in Thai, or literally "fish water," genuine fish sauce is the water, or juice, in the flesh of fish that is extracted in the process of prolonged salting and fermentation. It is made from small fish that would otherwise have little value for consumption. This can either be freshwater or saltwater fish, though today, most fish sauce is made from the latter as pollution and dams have drastically reduced the once plentiful supply of freshwater fish in the heartlands of Southeast Asia.