Sa tsraith seo, tugann an saineolaí timpeallachta Éanna Ní Lamhna turas abhainn na Bóinne. Ar an mbealach, casann sí le saineolaithe éagsúla, agus déanann siad plé ar an ról a bhí, agus atá, ag an abhainn i stair na tíre seo. Sa tríú clár sa tsraith inniu, tá Éanna ar ais le hÉamonn Ó Ciardha ag an Seandroichead, suíomh Chath na Bóinne. Siúlann an bheirt acu síos tríd choill go dtí bruach na habhann agus labhrann siad faoin tionchar a bhí ag an tírdhreach ar an gcath, chomh maith leis an tábhacht a bhí ag an gcath, ní hamháin ar stair na hÉireann ach ar an Eoraip chomh maith.
In this new five-part series, Éanna Ní Lamhna takes a tour of the River Boyne. En route, she meets up with various experts, and they discuss the role that the river had, and has, in the history of this country. Today, Éanna starts at Oldbridge, the site of the Battle of the Boyne, and is joined by Éamonn Ó Ciardha. They walk down through a wood to the banks of the river, and discuss the influence of the landscape on the Battle of the Boyne, as well as the importance of that event on the history of Ireland, and Europe.