English: Dros Lyn Ystumllyn i Foel y Gest - Across Llyn Ystumllyn to Moel y Gest The tautologously named Llyn Ystumllyn (Lake of the meandering lake) once virtually surrounded the church of St Cynhaearn on Ynyscynhaearn (Cynhaearn's Island). Although still marked on the OS maps, the lake was largely drained into the sea near Y Greigddu (Blackrock) in the 19th century. The river running through the remaining wetlands is now called Afon Cedron, but was formerly Afon Dowarch. The earlier name of the village of Pentrefelin was Aberdowarch. In the background is the bulk of Moel y Gest and below it to the right Y Greigddu (Blackrock).