11:30Our RiversEpisode 1: The Ballinderry River: Volcanoes, Crayfish, Castles and PearlsBBC Radio Ulster Duration: 30 minutes Sat 6th Sep 2008, 11:30 on BBC Radio FoyleHelen Mark and Michael McNamee take in castles, mussels and fishing as they follow the Ballinderry from the foothills of the Sperrins down to Lough Neagh.GenresFactualScience & NatureFormatsDocumentariesSeriesOur Rivers Source: BBC Online