| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | View on map |
|---|---|---|---|---|---|---|---|
| Ysceifiog | Wales | Flintshire | Holywell | churchyard | Yes | Ancient 4m-5m | View On Map |
| Ystrad Aeron | Wales | Ceredigion | Lampeter | churchyard | Yes | Ancient 5m-7m, Ancient 7m+ | View On Map |
| Ystradfellte | Wales | Powys | Merthyr Tydfil | churchyard | Yes | Ancient 4m-5m, Ancient 5m-7m, Ancient 7m+ | View On Map |
| Ystradffin | Wales | Carmarthenshire | Llandovery | churchyard | Yes | Ancient 7m+ | View On Map |
| Ystradgynlais | Wales | Powys | Neath | churchyard | Yes | Ancient 4m-5m, Ancient 7m+, Lost | View On Map |
| Yvignac -la – Tour | France | Cotes d' Armor - Bretagne | Dinan | churchyard | Yes | Ancient 7m+ | View On Map |
| Zeal Monachorum | England | Devon | Crediton | churchyard | Yes | Ancient 5m-7m | View On Map |