In the village of Penallt, the ghost of a woman in white who drowned herself, is said to haunt the area where she died. She was supposed to have drowned in an old millpond near a place called 'The Generals'. It is said she walks from an area called ‘The Argoed’ to then re-enact the scene of her death at the pool.
For further information, please read The Ghosts of Gwent by Alan Roderick.