Where in the world?
The flag of Sweden has a blue field with a yellow Scandinavian cross that extends to the edges of the flag.

Sweden

Sverige

Population: 10,353,442

Region: Europe

Subregion: Northern Europe

Capital: Stockholm

Top Level Domain: .se

Currencies: Swedish krona

Border countries

The flag of Finland has a blue Nordic cross on a white field.

Finland

Population: 5,530,719

Region: Europe

Capital: Helsinki
The flag of Norway has a red field with a blue cross outlined in white that extends to the edges of the flag.

Norway

Population: 5,379,475

Region: Europe

Capital: Oslo