Where in the world?
The flag of Finland has a blue Nordic cross on a white field.

Finland

Suomi

Population: 5,530,719

Region: Europe

Subregion: Northern Europe

Capital: Helsinki

Top Level Domain: .fi

Currencies: Euro

Border countries

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

Sweden

Population: 10,353,442

Region: Europe

Capital: Stockholm
The flag of Russia has three horizontal stripes of white, blue, and red.

Russian Federation

Population: 144,104,080

Region: Europe

Capital: Moscow