Coordonnées géographiques du cadre des bassins-versants étudiés.
| numéro | bv | xmin | xmax | ymin | ymax | Cours d'eau | Communes | Dpt | Codes hydro |
| 1 | 1 | 250,5 | 264,5 | 2396,0 | 2409,0 | Guébriand | Saint Cast | 22 | J 114400 |
| 2 | 2 | 283,5 | 289,5 | 2412,5 | 2419,0 | Ste Suzanne | St Coulomb | 35 | J 081 |
| 3 | 3 | 316,0 | 336,0 | 2374,5 | 2385,0 | Minette | Romazy | 35 | J 011400 |
| 4 | 4 | 271,0 | 292,0 | 2321,0 | 2339,0 | Combs | Maure de Bretagne | 35 | J 865030 |
| 5 | 5 | 202,5 | 213,0 | 2362,0 | 2372,5 | Blavet | Guerlédan | 56 | J 541021 |
| 6 | 6 | 184,0 | 196,5 | 2337,5 | 2349,5 | Brandifrout | Melrand | 56 | J 553410 |
| 7a | 7 | 114,0 | 133,0 | 2357,0 | 2373,5 | Steir | Quimper | 29 | J 430030 |
| 7i | 8 | 109,0 | 124,5 | 2353,0 | 2366,0 | Steir inf. | Quimper | 29 | J 431030 |
| 10a | 9 | 124,5 | 182,5 | 2365,0 | 2406,0 | Aulne | |
29 | |
| 10i | 10 | 118,0 | 136,0 | 2369,0 | 2381,0 | Aulne inf. | Chateaulin | 29 | J 382018 |
| 11 | 11 | 120,5 | 125,5 | 2402,0 | 2407,0 | Kerouallon | Loc Eguiner | 29 | J 341650 |
| 12 | 12 | 128,5 | 137,0 | 2392,5 | 2399,0 | Elorn | Mougau | 29 | J 340030 |
| 13 | 13 | 128,5 | 136,0 | 2375,5 | 2381,0 | Vernic | Pleyben | 29 | J 382600 |
