Administrative Region : West Greece
Regional unit : Ilia

Sosti (Greek, Modern: Σοστί, Ancient/Katharevousa: -on), older spellings, Sostio, Sostion, formerly Vlachaiika is a community located between Afgeio and Amaliada in the municipality of Amaliada and the prefecture of Ilia. Distance from Amaliada is about 4 km N, Gastouni is about 10 km and GR-9/E55 is 9 km ESE, and about 11 km W of the Peneus Barrier.

Sosti as a community was formed after a law of 1919. It was formed from the community Bouhioti (Avgreion) of the formed municipality of Ilida. After a law of 1927 Labdeika was included former part of the municipality of Amaliada.

The name Sostis according to a version means "Saviour", as it helped according to a legend some troops of Kolokotronis to survive in the village, although not much is known about the village itself in the Ottoman period. A church Koimisis tis Theotokou was build 1871 in the region, and an inscription was found in the small nearby church Agios Georgios from 1471. In a place called Zeza in 1821 there was a battle between Greek troops of Sisinis and Ottoman forces. Since 1902 the village had an elementary school

Nearest places

• Afgeio (north)
  
• Ancient Elis (northeast)
  
• Ilida (northeast)
  
• Chavari (east)
  
• Agios Ioannis (east)
  
• Amaliada (S)
  
• Ampelokipoi (west), not connected by road.
  
• Roupaki (northwest)
  

Location:

• Latitude: 37.8667 (37°52') N
  
• Longitude: 21.35 (21°21') E
  

Postal code: 272 00

Elevation: about 10 m

highest: 50 m

Dialing code: +30-26220

Year	Communal population
1981	358
1991	350
2001	417

The village has a small school, a church and a (plateia). The area is used for farming but the area is also mixed with olive groves and some forests.