The Solomon Islands is an archipelago country in Oceania consisting of nearly 1,000 islands. Solomon Islands has a strategic location on sea routes between the South Pacific Ocean, the Solomon Sea, and the Coral Sea. Proximate countries include Papua New Guinea, Vanuatu, Tuvalu, and Australia. The geography of Solomon Islands is mostly mountainous with rainforests covering some islands. The government system is a parliamentary democracy and a Commonwealth realm; the chief of state is the queen of the United Kingdom, and the head of government is the prime minister. Solomon Islands has a traditional economic system in which the allocation of available resources is made on the basis of primitive methods, and many citizens engage in subsistence agriculture.