Q. Billionth Barrel Monument is located in which country?
Answer: Brunei
Notes: Billionth Barrel Monument is located in Seria, Brunei. This monument was built to commemorate the billionth barrel of oil extracted from Seria oilfield, the birthpalce of Brunei's petroleum industry, in Brunei. This monument was commissioned by the Brunei Shell Petroleum Company in 1991. This monument was unveiled by Hassanal Bolkiah, the 29th and current Sultan of Brunei.