Just to the north lies the privately owned Puffin Island (Ynys Seriol), known as Priestholm, also home to an early medieval monastery.
Ychydig i'r gogledd mae Ynys Seiriol, neu Ynys Lannog, sy'n eiddo preifat, ac a oedd hefyd yn gartref i fynachlog ganoloesol gynnar.