| Borehole No H-128 | Estonia | 59.0N, 24.8E | 0 | 0 | 0 | 0 | |
| Borehole No 5700 | Estonia | 59.0N, 26.9E | 1 | 0 | 1 | 0 | |
| Borehole No 416, Viljandi county | Estonia | 58.3N, 25.7E | 0 | 0 | 0 | 0 | |
| Orissaare 853 borehole | Estonia | 58.6N, 23.1E | 1 | 14 | 0 | 0 | |
| Orissaare 855 borehole | Estonia | 58.6N, 23.1E | 0 | 0 | 0 | 0 | |
| Orissaare 856 borehole | Estonia | 58.6N, 23.1E | 0 | 0 | 0 | 0 | |
| Orissaare 859 borehole | Estonia | 58.6N, 23.1E | 3 | 95 | 14 | 18 | |
| Orissaare 860 borehole | Estonia | 58.6N, 23.1E | 1 | 2 | 0 | 0 | |
| Orissaare 862 borehole | Estonia | 58.6N, 23.1E | 1 | 24 | 0 | 0 | |
| Orjaku borehole | Estonia | 58.8N, 22.8E | 34 | 154 | 985 | 653 | |
| Oru borehole | Estonia | | 1 | 0 | 0 | 0 | |
| Oru F-12 borehole | Estonia | 59.4N, 27.6E | 4 | 21 | 61 | 223 | |
| Oru F-21 borehole | Estonia | 59.4N, 27.6E | 2 | 2 | 11 | 2 | |
| Oru F-23 borehole | Estonia | 59.4N, 27.6E | 4 | 2 | 9 | 3 | |
| Soojärve 330 borehole | Estonia | | 1 | 4 | 15 | 11 | |
| Oostriku 700 borehole | Estonia | 58.9N, 26.0E | 5 | 6 | 19 | 19 | |
| Jaama 5708G borehole | Estonia | 59.1N, 27.7E | 3 | 1 | 37 | 28 | |
| Otepää 2 borehole | Estonia | 58.0N, 26.5E | 17 | 331 | 221 | 213 | |
| Otsa F-120 borehole | Estonia | 59.6N, 25.8E | 3 | 0 | 2 | 2 | |
| Õunaku F-354 borehole | Estonia | 58.8N, 22.9E | 4 | 0 | 85 | 96 | |
| Ovishi 94 borehole | Latvia | 57.6N, 21.9E | 13 | 23 | 50 | 23 | |
| Ruunavere 2 borehole | Estonia | | 1 | 24 | 0 | 0 | |
| Osmino 111 borehole, Leningrad Oblast | Russia | 59.3N, 29.6E | 3 | 58 | 349 | 247 | |
| Borehole No. 1110 | Estonia | | 0 | 0 | 1 | 0 | |
| Borehole No 1149 | Estonia | 59.1N, 24.8E | 1 | 2 | 35 | 34 | |