| Location Ocean | Na+ (mean) | K+ (mean) | Na+/K+ (mean) | Seaweed species | Na+ (mean) | K+ (mean) | Na+/K+ (mean) |
| Netherlands | 9983 | 321 | 31.1 | Ulva lactuca | 1363.0 | 1205.0 | 1.13 |
| Indonesia | 10020 | 384 | 26.1 | Caulerpa sert. | 6238.8 | 481.0 | 12.97 |
| Cuba | 10840 | 361 | 30.0 | Caulerpa brach. | 6678.5 | 675.5 | 9.89 |
| Ireland | 18230 | 547 | 33.3 | Undaria pinnat. | 3147.0 | 121.3 | 25.94 |