| Ranscombe Farm Nature Reserve Plantlife | 278.74 ha | | — |
| RSPB Northward Hill Nature Reserve Royal Society for the Protection of Birds | 271.23 ha | | — |
| RSPB Cliffe Pools Nature Reserve | 242.65 ha | | — |
| RSPB Nor Marsh Nature Reserve | 85.42 ha | | — |
| Capstone Farm Country Park | 67.0 ha | | — |
| Salt Fleet Flats Reserve | 64.08 ha | | — |
| Darland Banks Kent Wildlife Trust | 56.14 ha | | — |
| Deangate Community Parkland | 54.49 ha | | — |
| Great Lines Heritage Park Greenspace Development Team | 39.16 ha | 🐕 | — |
| Rainham Dock Medway Council | 19.74 ha | | — |
| Temple Marsh | 13.85 ha | | — |
| Luton Recreation Ground | 12.16 ha | | — |
| Broomhill Park | 10.88 ha | | — |
| Rede Common | 10.86 ha | | — |
| Queen Elizabeth Fields | 10.27 ha | | — |
| The Strand Lido and Leisure Park Medway Council | 9.91 ha | 🐕 | — |
| Berengrave Local Nature Reserve | 9.61 ha | | — |
| Riverside Country Park Medway Council | 9.04 ha | | — |
| Rainham Dock East Medway Council | 6.75 ha | | — |
| Lower Lines Park Fort Amherst Trust | 5.68 ha | 🐕 | — |
| Watts Meadow | 5.48 ha | | — |
| Cozenton Park | 5.32 ha | | — |
| Hillyfields Community Park Medway Council | 4.39 ha | 🐕 | — |
| Matts Hill Farm | 4.21 ha | | — |
| Esplanade Gardens | 3.61 ha | | — |
| Forge Common High Halstow Parish Council | 3.35 ha | | — |
| Wigmore Park | 2.91 ha | | — |
| Parkwood Green | 2.72 ha | | — |
| Victoria Gardens Medway Council | 2.67 ha | | — |
| Cuxton Recreation grounds | 2.5 ha | | — |
| Hemony Grove Recreation Ground | 2.32 ha | | — |
| Pottery Road Recreation Ground | 2.24 ha | | — |
| Hoo Common | 2.21 ha | | — |
| Copperfield Park | 2.15 ha | | — |
| Churchfields | 2.11 ha | | — |
| Cherry Tree Orchard | 1.88 ha | | — |
| High Halstow Recreation Ground High Halstow Parish Council | 1.79 ha | 🐕 | — |
| Town Hall Gardens Medway Council | 1.51 ha | | — |
| Friston Way Park | 1.46 ha | | — |
| Rochester Castle Gardens Medway Council | 1.39 ha | | — |
| Riverside Gardens | 1.18 ha | | — |
| Platters Park | 1.15 ha | | — |
| The Vines | 1.15 ha | | — |
| Prince Arthur Park Medway Council | 1.11 ha | | — |
| Luton Millennium Green | 1.09 ha | | — |
| Liberty Park | 1.04 ha | | — |
| Princes Avenue Recreation Ground Medway Council | 0.94 ha | | — |
| Watermill Gardens Medway Council | 0.85 ha | | — |
| The Paddock Medway Council | 0.46 ha | | — |
| Chatham Naval Memorial Commonwealth War Graves Commission | 0.4 ha | | — |
| Balmoral Gardens Medway Council | 0.36 ha | | — |