Where in the world?
The flag of Poland has two horizontal stripes of equal width, white on the top and red on the bottom.

Poland

Polska

Population: 37,950,802

Region: Europe

Subregion: Central Europe

Capital: Warsaw

Top Level Domain: .pl

Currencies: Polish złoty

Border countries

The flag of Belarus has a red field with a green horizontal stripe at the bottom and a white and red ornamental pattern on the hoist side.

Belarus

Population: 9,398,861

Region: Europe

Capital: Minsk
The flag of the Czech Republic has two equal horizontal bands of white and red with a blue isosceles triangle based on the hoist side.

Czech Republic

Population: 10,698,896

Region: Europe

Capital: Prague
The flag of Germany has three horizontal stripes of black, red, and gold.

Germany

Population: 83,240,525

Region: Europe

Capital: Berlin
The flag of Lithuania has three horizontal stripes of yellow, green, and red.

Lithuania

Population: 2,794,700

Region: Europe

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

Russian Federation

Population: 144,104,080

Region: Europe

Capital: Moscow
The flag of Slovakia has three horizontal stripes of white, blue, and red with a coat of arms on the left side.

Slovakia

Population: 5,458,827

Region: Europe

Capital: Bratislava
The flag of Ukraine has two horizontal bands of blue and yellow.

Ukraine

Population: 44,134,693

Region: Europe

Capital: Kyiv