Simplify the following text for a Grade 5 native English-speaking person.
Original: Galena is located at ( 42.418171 , -90.431472 ) . According to the United States Census Bureau , the city has a total area of 3.7 m. Galena is situated along the Galena River , which is one of many tributaries of the Mississippi River .
Simplified: Galena is a city of Illinois in the United States .