Where are the largest oil reserves found in the world?

The countries with the largest oil reserves as of January 1, 2015 are as follows:

(Per barrel)

1. Saudi Arabia- 262,600,000,000 (262.6 Billion)
2. Venezuela- 211,200,000,000 (211.2 Billion)
3. Canada- 175,200,000,000 (175.2 Bilion)
4. Iran- 135,000,000,000 (135 Billion)
5. Iraq- 115,000,000,000 (115 Billion)
6. Kuwait- 104,000,000,000 (104 Billion)
7. United Arab Emirates- 97,800,000,000 (97.8 Billion)
8. Russia- 60,000,000,000 (60 Billion)
9. Lybia- 46,420,000,000 (46.42 Billion)
10. Nigeria- 37,200,000,000 (37.2 Billion)