Aliud miraculum est, id est Oper Linn Liguan. Ostium fluminis illius fluit in Sabrina et quando Sabrina inundatur ad sissam, et mare inundatur similiter in ostio supra dicti fluminis et in stagno ostii recipitur in modum voraginis et mare non vadit sursum et est litus juxta flumen et quamdiu Sabrina inundatur ad sissam, istud litus non tegitur et quando recedit mare et Sabrina, tunc Stagnum Liuan eructat omne quod devoravit de mari et litus istud tegitur et instar montis in una unda eructat et rumpit. Et si fuerit exercitus totius regionis, in qua est, et direxerit faciem contra undam, et exercitum trahit unda per vim humore repletis vestibus et equi similiter trahuntur. Si autem exercitus terga versus fuerit contra eam, non nocet ei unda.
'There is another wonder, to wit Aber Llyn Lliwan. The water from the mouth of that river flows into the Severn, and when the Severn is in flood up to its banks, and when the sea is also in flood at the mouth of the above-named river and is sucked in like a whirlpool into the pool of the Aber, the sea does not go on rising: it leaves a margin of beach by the side of the river, and all the time the Severn is in flood up to its bank, that beach is not covered. And when the sea and the Severn ebb, then Llyn Lliwan brings up all it had swallowed from the sea, and that beach is covered while Llyn Lliwan discharges its contents in one mountain-like wave and vomits forth. Now if the army of the whole district in which this wonder is, were to be present with the men facing the wave, the force of it would, once their clothes are drenched by the spray, draw them in, and their horses would likewise be drawn. But if the men should have their backs turned towards the water, the wave would not harm them [6].'