| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Ydra (Hydra) | city | Attiki | Greece | 37.35 | 23.47 | 85 | 1850 |
| Ydraia | city | Kentriki Makedonia | Greece | 40.96 | 22.08 | 324 | 10153 |
| Ydrea | city | Kentriki Makedonia | Greece | 40.96 | 22.08 | 324 | 10153 |
| Ydroussa | city | Dytiki Makedonia | Greece | 40.72 | 21.46 | 2509 | 3843 |
| Ydroússa | city | Voreio Aigaio | Greece | 37.78 | 26.75 | 1669 | 7285 |