Cache is in a park area near a good view of the Aberytwyth train-line.The Ystwyth river, from where Aberytwyth gets its name (Literally Aber-Ystwyth means the Ystwyth-Mouth. Although oddly the river this runs near it actually the Rheidol: or the mouth of the river Rheidol, where it meets the sea).
Contents of the Alphabet Series, please try make sure replacement items have something to do with the letter P.