Blatná na Ostrove
Blatná na Ostrove 
    Sárosfa  | |
|---|---|
Location of Blatná na Ostrove in the Trnava Region Location of Blatná na Ostrove in Slovakia  | |
| Coordinates: 48°01′N 17°26′E / 48.01°N 17.44°E | |
| Country | Slovakia | 
| Region | Trnava Region | 
| District | Dunajská Streda District | 
| First mentioned | 1286 | 
| Government | |
| • Mayor | Terézia Földváry | 
| Area | |
 • Total  | 10.78 km2 (4.16 sq mi) | 
| Elevation | 121 m (397 ft) | 
| Population  (2021)  | |
 • Total  | 990 | 
| Ethnicity | |
| • Hungarians | 87.89% | 
| • Slovaks | 10.17% | 
| Time zone | UTC+1 (CET) | 
| • Summer (DST) | UTC+2 (CEST) | 
| Postal code | 930 32  | 
| Area code | +421 31 | 
| Car plate | DS | 
| Website | www | 
Blatná na Ostrove (Hungarian: Sárosfa, pronounced [ˈʃaːroʃfɒ]) is a village and municipality in the Dunajská Streda District in the Trnava Region of south-west Slovakia. It has a post-office, a food store, a petrol station, and a bar. There is also a football playground and a public library in the village.