Estonia has a population of 1.34 million people and its capital and largest city is Tallinn. The country has a flag featuring blue, black and white colors and uses the Estonian kroon as its currency. Estonia's national flower is the cornflower, national bird is the swallow, and national stone is limestone. Some of its largest geographical features include the 162km long Võhandu River and 318m tall Suur Munamägi mountain. Important mineral resources include oil shale, phosphorite, peat, and various types of stone. The largest islands are Saaremaa, Hiiumaa, Muhu, and Vormsi and there are meteorite impact craters