The Sultanate of Brunei is a small but very rich country thanks to natural gas and petroleum resources. It is surrounded by Malaysia and has two parts physically separated by Malaysia, almost being an enclave. Strategically located on the South China Sea, close to vital sea lanes linking Indian and Pacific Oceans, it has an exclusive economic fishing zone that extends as far as Louisa Reef in the southern Spratly Islands although it makes no public territorial claim to the offshore reefs. Brunei is officially an Islamic state, with many large beautiful mosques across the country. Sale of alcohol is banned. Bringing in meat, (other than seafood) which has not been certified "halal", (slaughtered according to Islamic law), is also banned. During the fasting month of Ramadan, many shops and restaurants will be open. However, eating, drinking or smoking in front of people who are fasting is considered rude and asking permission is appropriate. The bulk of the population is Malay (67 percent) and there is also a significant Chinese minority of some 15 percent as well as a number of indigenous peoples, including the Iban and Duson tribes who inhabit the jungle upriver and the Temburong district, (the smaller eastern part detached from the rest of Brunei).