Many iconic rivers readily slip from the tongue. The Amazon, the Nile, the Thames, the Ganges and the Mekong are just a few. Each has its unique history and is lauded and sometimes worshipped for its role in the lives of those who dwell on its banks. For different reasons, we can also add to this list the River Mersey, which flows from Greater Manchester to Merseyside in northern England. Its fame is mainly due to its association with Liverpool, the Beatles, and the 1960s Merseybeat musical movement. People of a…