### What is the longest river in Leinster Ireland?

The longest river completely in Leinster is the river Liffey. There are longer rivers that are partially in Leinster, including Ireland's longest river, the Shannon. The longest river completely in Leinster is the river Liffey. There are longer rivers that are partially in Leinster, including Ireland's longest river, the Shannon. The longest river completely in Leinster is the river Liffey. There are longer rivers that are partially in Leinster, including Ireland's longest river, the Shannon…