(Adds landfall seen within 30 hours, paragraphs 5-6)

RIYADH, June 4 (Reuters) - The world's top oil exporter Saudi Arabia said on Monday its main oil-exporting region would not be affected by a storm nearing the Arabian Peninsula, but southern neighbour Oman put its army and police on high alert.

"There will not be a direct effect from the Gonu storm in the central and eastern regions of the kingdom," said Saudi state-run al-Ikhbariya television in a flash citing the weather service of the leading OPEC producer.

Oman called on people living in areas at risk to leave before the cyclone reaches land, the official ONA news agency said. Oman's weather service warned of winds of 185 km-205 km (114-128 miles) per hour causing "very high waves".

It named two Indian Ocean islands exposed to danger.

Omani state television said the storm was located about 580 km from the sultanate's coast and approaching it at about 18 km per hour.

"It will make landfall within 30 hours," the television said.

Oman's 715,000 barrels per day (bpd) oil production is much smaller than Saudi Arabia's output of close to nine million bpd.

In OPEC member the United Arab Emirates, a shipping agent said no official warning had been issued although the country's eastern coastline opens onto the Indian Ocean.

"The note we all received today just mentioned we should be expecting some wind and rain and we did not get any official warning," said the Abu Dhabi-based agent.

A Dubai-based shipping agent also said no official warning had been sent to his company.

"If it was dangerous, we would have been informed," he said.

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