| Pembrey Country Park | 281.41 ha | 🐕 | — |
| Waun Las National Nature Reserve | 121.0 ha | | — |
| Llanelli Wetland Centre Wildfowl and Wetlands Trust | 112.72 ha | | — |
| Mynydd Mawr Woodland Park | 106.52 ha | | — |
| National Botanic Garden of Wales | 89.43 ha | | — |
| Dinefwr Park | 69.8 ha | | — |
| Allt Rhyd y Groes National Nature Reserve | 69.59 ha | | — |
| Llyn Llech Owain Country Park | 64.89 ha | | — |
| Carmel National Nature Reserve | 51.33 ha | | — |
| RSPB Gwenffrwd-Dinas | 51.09 ha | | — |
| Cors Goch Llanllwch National Nature Reserve SSSI Natural Resources Wales | 43.11 ha | | — |
| Carmel National Nature Reserve | 31.95 ha | | — |
| Ffrwd Farm Mire Nature Reserve | 20.27 ha | | — |
| Ynys Dawela Nature Park | 16.98 ha | | — |
| Carreg Cennen Woodlands Local Nature Reserve | 15.81 ha | | — |
| Morfa Berwig Local Nature Reserve | 13.56 ha | | — |
| Allt Nant-y-Ci Recreation Park | 12.25 ha | | — |
| Gelli Werdd Recreation Park | 11.87 ha | | — |
| Grasslands Trust | 8.94 ha | | — |
| Parc Howard | 8.71 ha | | — |
| Grasslands Trust | 8.58 ha | | — |
| People's Park Llanelli Town Council | 7.17 ha | | — |
| Ashpits Pond Local Nature Reserve | 6.95 ha | | — |
| Pontyberem Park | 6.9 ha | | — |
| Crown Park Llanelli Town Council | 6.57 ha | 🐕 | — |
| Memorial Park | 5.98 ha | | — |
| Aberglasney Gardens | 5.4 ha | | — |
| Penyfan Quarry | 5.37 ha | | — |
| Penyfan Park | 5.19 ha | 🐕 | — |
| Pwll Lagoon Local Nature Reserve | 5.13 ha | | — |
| Parc Golwg Yr Aman | 5.05 ha | | — |
| Carmarthen Park | 4.1 ha | | — |
| Nant Melin Nature Reserve The Wildlife Trust of South and West Wales | 3.93 ha | | — |
| Glandafen Park | 3.79 ha | | — |
| Ammanford Park Ammanford Town Council | 3.37 ha | 🐕 | — |
| King Field Ystradowen | 3.35 ha | | — |
| Cwmamman Park | 3.21 ha | | — |
| Smart's Quarry SSSI | 2.84 ha | | — |
| Parc y Bocs | 2.74 ha | | — |
| Betws Park | 2.6 ha | | — |
| Coed Wern-Ddu The Wildlife Trust of South & West Wales | 2.15 ha | | — |
| Llangunnor Community Park | 1.81 ha | | — |
| Penlan Park | 1.27 ha | | — |
| Parc Myrddin | 1.23 ha | | — |
| Parc Le Conquet | 1.22 ha | | — |
| Parc Cefneithin | 1.2 ha | | — |
| Drefach Park | 1.13 ha | | — |
| Parc Hinds | 1.07 ha | | — |
| Penllwyn Park | 1.07 ha | | — |
| Havelock Park Llanelli Town Council | 0.58 ha | | — |
| Sensory Garden Glyn Nest Care Home | 0.06 ha | | — |
| Gerddi Plonovez Porzay Newcastle Emlyn Town Council | 0.04 ha | | — |