A saltern is a place where salt is produced. There are many synonyms for the word 'saltern' that can be used depending on the context of the sentence. Some of the commonly used synonyms for saltern are saltworks, salt mine, salt pans, salt flats, salt marsh, and salt pit. These synonyms indicate different methods of salt production used in different parts of the world. For example, salt pans are shallow ponds used to extract salt from seawater, whereas salt mines are underground tunnels to extract salt from salt rocks. Overall, using synonyms for the word saltern can enrich one's vocabulary and lend a better understanding of the context presented in the sentence.