Littorina
| Site | Municipality (county) | Num. obs. | Num. species | Num. images | Last obs. | |
|---|---|---|---|---|---|---|
| Hafrsfjord | Rogaland, Norway | 85 | 2 | 0 | 1998-09-28 | |
| Hagland | Nordland, Norway | 4 | 2 | 0 | 1996-10-03 | |
| Halsnøy | Vestland, Norway | 51 | 2 | 0 | 1996-09-25 | |
| Halsnøy Kloster | Vestland, Norway | 1 | 1 | 0 | 2019-05-23 | |
| Halsnøy kloster | Vestland, Norway | 1 | 1 | 0 | 2019-05-23 | |
| Halsnøy kloster | Vestland, Norway | 1 | 1 | 0 | 2019-05-23 | |
| Hamn, badeplassen | Vestland, Norway | 1 | 1 | 0 | 2014-05-06 | |
| Handelslagsfjæro | Vestland, Norway | 12 | 1 | 0 | 2016-09-07 | |
| Hansbakkfjæra | Trøndelag, Norway | 10 | 2 | 0 | 2018-05-23 | |
| Hanøy | Vestland, Norway | 10 | 2 | 0 | 1995-10-11 | |
| Haram | Møre og Romsdal, Norway | 17 | 2 | 0 | 1995-10-17 | |
| Haramsøy | Møre og Romsdal, Norway | 24 | 1 | 0 | 1994-11-04 | |
| Harøy | Møre og Romsdal, Norway | 83 | 2 | 0 | 1998-10-30 | |
| Heissa | Møre og Romsdal, Norway | 11 | 1 | 0 | 1995-10-27 | |
| Helgeroafjorden | Vestfold, Norway | 4 | 1 | 0 | 1993-12-08 | |
| Hellandsjøen | Trøndelag, Norway | 8 | 2 | 0 | 1996-09-06 | |
| Hellestø/Sele | Rogaland, Norway | 2 | 1 | 0 | 1998-10-01 | |
| Helleøya | Agder, Norway | 10 | 1 | 0 | 1993-10-21 | |
| Herdla | Vestland, Norway | 3 | 2 | 0 | 2008-06-17 | |
| Herdla | Vestland, Norway | 25 | 2 | 0 | 1995-10-06 | |
| Hestvika | Trøndelag, Norway | 11 | 1 | 0 | 1995-01-02 | |
| Hetland | Rogaland, Norway | 7 | 2 | 0 | 1996-10-03 | |
| Hetlevik | Vestland, Norway | 16 | 2 | 0 | 1995-10-13 | |
| Hetlevikstraumen | Vestland, Norway | 1 | 1 | 0 | 2022-09-28 | |
| Hisøy | Agder, Norway | 69 | 2 | 0 | 1997-10-02 | |
| Hjelset | Møre og Romsdal, Norway | 8 | 1 | 0 | 1993-09-23 | |
| Hjørungavåg | Møre og Romsdal, Norway | 4 | 1 | 0 | 1993-11-08 | |
| Hodne/Reve (Bore) | Rogaland, Norway | 5 | 1 | 0 | 1993-09-01 | |
| Hofles | Trøndelag, Norway | 1 | 1 | 0 | 1994-10-04 | |
| Holm | Nordland, Norway | 8 | 1 | 0 | 1994-11-29 | |
| Holmavegen 2 | Rogaland, Norway | 1 | 1 | 0 | 2018-06-05 | |
| Holmenskjæret | Akershus, Norway | 15 | 1 | 0 | 2017-09-20 | |
| Holmestrand | Vestfold, Norway | 52 | 2 | 0 | 1998-09-18 | |
| Holmestrand | Vestfold, Norway | 4 | 1 | 0 | 1994-11-10 | |
| Holtefjell | Vestfold, Norway | 64 | 2 | 0 | 1998-09-24 | |
| Horten | Vestfold, Norway | 102 | 2 | 0 | 1998-10-08 | |
| Hosteland | Vestland, Norway | 2 | 1 | 0 | 1994-09-01 | |
| Hovedøya | Oslo, Norway | 9 | 1 | 0 | 1996-10-16 | |
| Hundvåg | Rogaland, Norway | 51 | 2 | 0 | 1997-10-14 | |
| Hundvåg | Rogaland, Norway | 65 | 2 | 0 | 2000-12-07 | |
| Hvasser | Vestfold, Norway | 19 | 1 | 0 | 1994-11-30 | |
| Hvasser | Vestfold, Norway | 55 | 2 | 0 | 1996-10-10 | |
| Hvervenbukta | Oslo, Norway | 1 | 1 | 0 | 2015-09-10 | |
| Hytteområde i Austefjorden | Vestland, Norway | 2 | 2 | 0 | 2007-08-31 | |
| håkonshella | Vestland, Norway | 6 | 1 | 1 | 2019-06-13 | |
| Håkonshella | Vestland, Norway | 28 | 2 | 5 | 2020-06-12 | |
| Håkonshella | Vestland, Norway | 52 | 4 | 24 | 2020-10-14 | |
| Håkonshella | Vestland, Norway | 1 | 1 | 0 | 2015-12-10 | |
| Håkonshella - Pollen | Vestland, Norway | 2 | 2 | 2 | 2014-06-10 | |
| Håkonshellapollen | Vestland, Norway | 84 | 2 | 18 | 2020-06-12 |