The blue represents the thousands of lakes and the sky, while the white represents the snow that covers the land in winter. The cross is a Nordic Cross representing Christianity.
History
The 'Siniristilippu' (Blue Cross Flag) was adopted on May 29, 1918, shortly after Finland gained independence from Russia. The design was heavily influenced by the Danish Dannebrog.
Construction
A 11:18 ratio. A white field with a blue Nordic cross extending to the edges.