Colombia is a country in northwestern South America that borders the Pacific Ocean and the Caribbean Sea. Neighboring countries include Brazil, Ecuador, Panama, Peru, and Venezuela. The geography of Colombia is diverse with flat lowlands and high Andes Mountains. The government system is a republic in which the executive branch dominates government structure. The chief of state and head of government is the president. Colombia has a pro-market economic system in which the prices of goods and services are determined in a free price system. Colombia is a member of the Andean Community (ANCOM).