The flag of which country is in the picture?

The flag of Sweden (Swedish: Sveriges flagga) consists of a yellow or gold Nordic cross (i.e. an asymmetrical horizontal cross, with the crossbar closer to the hoist than the fly, with the cross extending to the edge of the flag) on a field of blue. The Nordic cross design traditionally represents Christianity. The design and colours of the Swedish flag are believed to have been inspired by the present coat of arms of Sweden of 1442, which is blue divided quarterly by a cross pattée of gold, and modelled on the Danish flag. Blue and yellow have been used as Swedish colours at least since Magnus III's royal coat of arms of 1275.

The dimensions of the Swedish flag are 5:2:9 horizontally and 4:2:4 vertically. The dimensions of the Swedish flag with a triple-tail are 5:2:5:8 horizontally and 4:2:4 vertically. The colors of the flag are officially established through the Natural Color System to be NCS 0580-Y10R for the shade of yellow, and NCS 4055-R95B for the shade of blue. They are also specified to Pantone PMS 301 C/U for blue and PMS 116 or PMS 109 U for yellow. The square-cut Swedish state flag is identical to the civil ensign. The Swedish law does not regulate the design of the Swedish pennant, but it is recommended that its color scheme should correspond with that of the flag.