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| Rohuneeme F-126 borehole | Estonia | 59.6N, 24.8E | 5 | 0 | 16 | 16 | |
| Roobimaa 881 borehole | Estonia | 58.3N, 21.9E | 0 | 0 | 0 | 0 | |
| Rooküla 7018 borehole | Estonia | 59.2N, 25.3E | 9 | 76 | 218 | 172 | |
| Roopa 987 borehole | Estonia | 58.3N, 21.9E | 0 | 0 | 0 | 0 | |
| Rootsivere 921 borehole | Estonia | 58.6N, 23.1E | 1 | 0 | 0 | 0 | |
| Riekstini 15 borehole | Latvia | 56.2N, 21.2E | 6 | 158 | 83 | 74 | |
| Siuge borehole | Estonia | | 1 | 0 | 0 | 0 | |
| Sigula F-124 borehole | Estonia | 59.4N, 25.6E | 9 | 32 | 28 | 28 | |
| Saia 668 borehole | Estonia | 58.3N, 22.4E | 1 | 0 | 0 | 0 | |
| Siimika F-328 borehole | Estonia | 59.1N, 24.2E | 7 | 12 | 28 | 14 | |
| Sillamäe borehole | Estonia | 59.4N, 27.7E | 1 | 0 | 0 | 0 | |
| Silma 988 borehole | Estonia | 58.2N, 21.9E | 0 | 0 | 0 | 0 | |
| Silma 989 borehole | Estonia | 58.2N, 21.9E | 0 | 1 | 0 | 0 | |
| Simuna borehole | Estonia | | 1 | 0 | 0 | 0 | |
| Sindi A533 borehole | Estonia | | 1 | 0 | 0 | 0 | |
| Sinima K87 borehole | Estonia | 58.7N, 22.5E | 0 | 0 | 0 | 0 | |
| Sinimäe 314 borehole | Estonia | 59.4N, 27.9E | 12 | 51 | 50 | 183 | |
| Sipa F-305 borehole | Estonia | 59.1N, 24.5E | 5 | 1 | 15 | 13 | |
| Sirvaku 280 borehole | Estonia | 58.2N, 26.8E | 3 | 0 | 64 | 154 | |
| Sibila 7035 borehole | Estonia | 59.1N, 25.4E | 4 | 1 | 108 | 51 | |
| Slantsy 1133 borehole | Russia | 59.1N, 28.1E | 0 | 0 | 0 | 0 | |
| Slantsy 246 borehole | Russia | | 7 | 18 | 26 | 139 | |
| Soera K73 borehole | Estonia | 59.0N, 22.8E | 0 | 0 | 0 | 0 | |
| Sompa 3 borehole | Estonia | 59.4N, 27.3E | 3 | 2 | 1 | 1 | |
| Sonda F-199 borehole | Estonia | 59.4N, 26.8E | 10 | 1 | 57 | 78 | |