Salt marsh is a type of coastal wetland that is found in areas with low-lying topography and is characterized by its salty or brackish water. The term 'salt marsh' is derived from the presence of salt-tolerant plants that grow in the area. The two crossword solutions, SALINA (6 letters) and TIDALPOOL (9 letters), are both related to salt marshes. A salina is a shallow body of saltwater that is often found in salt marshes, while a tidalpool is a pool of seawater that is created by the tide and is also commonly found in salt marshes.