High political risk, the main thing holding back international oil companies, also comes from a split between Moscow and oil-producing regions over control of resources.

It seems an apt description for one of the world's richest oil-producing regions.

Both countries border on the Persian Gulf, a major oil-producing region.

The rest is to be assigned to develop the oil-producing region or to be at the government's discretion.

An oil boomtown dating from the 1920s, it is still in the center of a prominent oil-producing region.

At least eight of the country's 32 provinces, including oil-producing regions of the northeast, were hit by the cuts.

It is precisely the economic risk posed by price fluctuations that forces us to spend diplomatic and military capital in oil-producing regions.

November 6: Iran's oil-producing region suffers a serious earthquake.

In 1986, the negative impact on oil-producing regions initally hurt the economy.

Sixty years ago, it was a major oil-producing region.