Colombia borders both the Caribbean Sea and the Pacific Ocean. It has a land area about 3/4 the size of Alaska. Colombia's terrain includes the Andes Mountains, which form a spine down the center of the country, and vast plains. The climate varies by region from tropical along the coasts to cool in the mountains. Coffee is Colombia's most important agricultural crop and it is a leading exporter of gold and emeralds. The population of Colombia is over 50 million people and nearly all speak Spanish.