Cambodia is considering increasing formal diplomatic relations with Iran, including establishing an embassy in the capital Tehran.
The Economist Intelligence Unit estimated in April the riel would depreciate an average 1.3 percent in 2010 and 2011.
Officials say a lack of confidence from both local and foreign investors has stymied construction recovery.
Cambodia insists it has been transparent in managing state revenue.
Shareholders last week voted in favor of more transparency in payments to host countries like Cambodia.
Two men were accused of incitement in an ongoing land dispute between villagers and a powerful ruling party senator.
It is not uncommon for companies to pay bonuses for concessions here, but what happened to that money remains unknown.
Nearly 2.2 million people visited Cambodia last year. About 1 million of those came from Thailand, either by air or road.
Cambodia has similar problems of debt, tax collection and corruption.
Malaysia is a large investor in Vietnam and Indonesia and now Cambodia wants to tempt some of those businesses.
Experts have singled out plans for two mainstream dams as the greatest threat to the productive inland fisheries of the Mekong region.
The number of foreign visitors to this town are in decline.