| Hoffler Creek(expression, territory, area, water, virginia) |
| Hollands Diep(expression, territory, area, europe) |
| Hryhorivsky Estuary(expression, territory, area, water, europe) |
| Hudson River National Estuarine Research Reserve(expression, territory, area, water, newyork) |
| Humber Estuary(expression, territory, europe, england) |
| Husky Lakes(expression, territory, area, canada) |
| IJsselmeer(expression, territory, europe, netherlands) |
| Iguape-Cananeia-Paranagua estuary lagoon complex(expression, territory, area, water) |
| Indian River Lagoon(expression, territory, area, water) |
| Inner Solway Estuary(expression, territory, europe, england) |
| Inner Tay Estuary(expression, territory, europe, scotland) |
| Inner Thames Estuary(expression, territory, europe, england) |
| Jacques Cousteau National Estuarine Research Reserve(expression, territory, area, water, jersey) |
| Jamaica Bay(expression, territory, area, water, newyork) |
| Kachemak Bay National Estuarine Research Reserve(expression, territory, area, water, alaska) |
| Kayamkulam Kayal(expression, territory, asia, india) |
| Kerala backwaters(expression, territory, asia, india) |
| Khadzhibey Estuary(expression, territory, area, water, europe) |
| Khatanga Gulf(expression, territory, area, europe, russia) |
| Kingsbridge Estuary(expression, territory, europe, england) |