Did the beatles sing about mersey river?

Yes, The Beatles sang about the River Mersey in their song "Ferry Cross the Mersey". The song was written by Gerry and The Pacemakers, a Liverpool band, and was released in 1964. The song became a hit and is considered one of the most famous songs about Liverpool and the River Mersey. The Beatles did not record the song themselves, but they did perform it live on several occasions.