The longest river in Ireland is the River Shannon, measuring 386 km (240 miles). The largest lake is Lough Neagh, Northern Ireland, which is 396 km² (153 miles²) in area.

The title of "longest river in the world" has been fought over for centuries and scientists still can't fully agree on what has been a contentious matter. According to the Guinness Book of World ...

Northern Ireland and Wales. This is the River Severn, the longest river in the UK. I’m in a place called Ironbridge where the River Severn runs through. And later locals Riley and Maisie will be ...