Source: http://hydro-data.hcmr.gr/ Spercheios River Basin & Coastal Management Information Portal

GADM (Global ADMinistrative borders) spatial data for all countries and their sub-divisions - Level 0.

European statistical borders - level 0 - states

The Flood Hazard Map highlights areas (in pixels of 1km) that are likely to experience flooding once in 20 years. The given value expresses how deep (in meters) the flood water...