The Billionth Barrel Monument is a monument located in Seria, Brunei. The monument is located near the S-1, the first well discovered in Seria Oil Field. The well was discovered by Brunei Shell Petroleum, an Oil and Gas company in 1929. The monument is located 38 meters from S-1, which is now located on the beach. The only marker that remains of S-1 is a corroded steel bar. On an elevated square, there are five pipes that form an arch structure that is crowned by a gilded coat of arms. The five pipes are reminiscent of the Five Pillars of Islam and the floor tiles are designed according to Islamic models.
