| Maardu F-535 borehole | Estonia | 59.4729, 25.0174 | 5 | 1 | 57 | 57 | |
| Masa 815 borehole | Estonia | 58.3519, 22.7174 | 2 | 4 | 0 | 0 | |
| Virtsu 360 borehole | Estonia | 58.6659, 23.5253 | 28 | 179 | 365 | 399 | |
| Mehikoorma 321 borehole | Estonia | | 0 | 9 | 2 | 0 | |
| Mehikoorma 421 borehole | Estonia | 58.2425, 27.4525 | 46 | 974 | 645 | 1529 | |
| Meiuste 806 borehole | Estonia | 58.5876, 22.6172 | 2 | 0 | 28 | 60 | |
| Melnitsa 9 borehole, Leningrad Oblast | Russia | 59.4500, 30.1181 | 1 | 0 | 18 | 9 | |
| Meriküla F-169 borehole | Estonia | 59.4188, 27.9679 | 10 | 14 | 82 | 75 | |
| Merivälja F-127 borehole | Estonia | 59.5048, 24.8376 | 4 | 0 | 20 | 20 | |
| Metsalauka K79 borehole | Estonia | 58.7205, 22.5815 | 0 | 0 | 0 | 0 | |
| Metsanurga F-301 borehole | Estonia | 59.1788, 24.5166 | 10 | 16 | 23 | 23 | |
| Metsiku F-135 borehole | Estonia | 59.5174, 26.0983 | 7 | 8 | 22 | 21 | |
| Metsküla 800 borehole | Estonia | 58.5693, 22.5435 | 1 | 0 | 0 | 0 | |
| Martna 15 borehole | Estonia | 58.8573, 23.7984 | 10 | 12 | 20 | 4 | |
| Maardu F-520 borehole | Estonia | 59.4530, 25.0208 | 1 | 0 | 0 | 0 | |
| Nurme-Alliku quarry | Estonia | 59.3962, 26.4392 | 1 | 3 | 1 | 1 | |
| Maardu F-501 borehole | Estonia | 59.4741, 24.9934 | 5 | 6 | 2 | 2 | |
| Maardu F-502 borehole | Estonia | 59.5019, 25.0343 | 2 | 0 | 3 | 4 | |
| Maardu F-503 borehole | Estonia | 59.4706, 25.0440 | 3 | 0 | 4 | 5 | |
| Maardu F-504 borehole | Estonia | 59.4890, 25.0880 | 2 | 0 | 2 | 2 | |
| Maardu F-505 borehole | Estonia | 59.4626, 25.0899 | 3 | 0 | 17 | 17 | |
| Maardu F-506 borehole | Estonia | 59.4540, 25.0313 | 1 | 0 | 0 | 0 | |
| Maardu F-507 borehole | Estonia | 59.4525, 25.0914 | 2 | 0 | 8 | 1 | |
| Maardu F-508 borehole | Estonia | 59.4527, 25.1363 | 3 | 1 | 58 | 62 | |
| Maardu F-511 borehole | Estonia | 59.5002, 25.0432 | 2 | 0 | 0 | 0 | |
