13:30Our RiversEpisode 1: The Ballinderry River: Volcanoes, Crayfish, Castles and PearlsBBC Radio Ulster Duration: 30 minutes Sun 27th Oct 2013, 13:30 on BBC Radio UlsterHelen 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