The official currency is Riel: Exchange rates fluctuate, 1 U.S. Dollar is currently valued around the 4,000 Riel mark. The Riel currency notes comes in the denominations of 100.000, 50.000, 20.000, 10.000, 5000, 2000, 1000, 500, 200, 100 and 50. However, US Dollars are widely used and most tourist establishments will quote prices in dollars. The climate in Cambodia is dominated by tropical monsoons and can be roughly divided into the rainy, cool and dry seasons. The rainy season extends from May to October, with average temperatures ranging from 24-33°c. The cool season starts in November and runs until January - temperatures are around 18-30°c. The country's most important heritage treasure is Angkor Wat, located centrally in the country in Siem Reap province. It has been described as one of the seven wonders of the world, listed by UNECSO as a world heritage site. Angkor Wat is the center of a rich historical, traditional and cultural heritage. It is justifiably Cambodia 's premier tourist destination. [caption id="attachment_53" align="aligncenter" width="1772"] Angkor Wat[/caption] The commercial heart of Cambodia is Phnom Penh . It is home to a thriving international and local trade sector. On the outskirts of the capital you will find numerous industrial facilities, especially garment factories. The country's international airports are situated in Phnom Penh and Siem Riep: Extensive port and container facilities can be found in Sihanoukville, four hours south west of the capital. Cambodia has an extensive road system and National Routes link Phnom Penh with every province and provincial towns. Most travel is by road, but boat and train links are also popular. Vehicles drive on the right hand side of the road, as in Europe and United States . The principle economic benefits come from the agriculture, tourism and garment manufacturing sectors: In recent year, the tourism industry has been the second largest income generator after the garment industry. This is an introduction to Cambodia.