The Gulf of Mexico, Mississippi river, and Texas are in a general area of America. However, not all touch. Mississippi would be the state that touches the Gulf of Mexico, Mississippi River, but not Texas.
Source: Minnesota Mouth: Louisiana Yes the mouth is in the gulf. Its source is Lake Itasca, northern Minnesota and its mouth is Pilottown, Gulf of Mexico. Yes the mouth of the Mississippi River is the Gulf of Mexico. The mouth of a river is where the river empties.