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Vadim Ghirda, Associated Press
A man walks on the deck of an ice breaker ship, trying to free itself from frozen Danube waters, in Giurgiu, southern Romania, Wednesday, Feb. 8, 2012. Bulgaria and Romania are suspending all shipping on the Danube River due to severe frost and the vast amount of ice blocking the heavily traveled waterway, Bulgaria's Transport Ministry said Wednesday.Authorities say up to 90 percent of the river surface is covered with floating ice, making it extremely difficult to traverse Europe's main commercial waterway, which winds 2,860-kilometer (1,777-mile) from Germany and serves as the natural border between Bulgaria and Romania.

BUCHAREST, Romania — European shippers say they are losing millions because a lengthy stretch of the Danube — one of Europe's key waterways — is stuck in the longest freeze in recent memory.

Huge chunks of ice floated down the middle of the Danube on Friday in southern Romania while water close to the banks remained iced over, with barges, boats and ships tangled in a wintry web.

The Danube flows for 1,785 miles (2,872 kilometers) through nine countries, starting in Germany's Black Forest, before passing through Austria, Slovakia, Hungary, Croatia, Serbia, Bulgaria, Romania, and Ukraine.

The river began to ice over in early February as temperatures plunged to minus 20 Celsius (-4 Fahrenheit). The freeze followed a drought in the fall in which water levels had dropped so low that it was interfering with shipping along the international waterway.

By Friday, ice had halted shipping on 440 miles (700 kilometers) of the Danube in Romania, an official from the Romanian Transportation Ministry told The Associated Press, speaking on the department's customary condition of anonymity.

The river forms the border between Romania and Bulgaria and six river crossings were also closed due to the ice. Upstream, the river was also iced over in parts in the Serbian capital of Belgrade.

Costache Constantin, manager of Europolis Shipping & Trading shipping company, surveyed the scene from a warm office in the Romanian Black Sea port of Constanta. He said he'd never seen such a drawn-out freeze on the Danube since he began working in the industry in 1981.

"This is costing millions of euros. The transportation of raw materials, coal, minerals, cereals ... are all affected, construction materials too," he said by telephone.

The Constanta port also froze over last week and the dockyard was closed due to icy weather.

Viorel Panait, a manager for Convex SA, a port services company involved in the shipping of iron ore, coal and bauxite, said his firm was busy figuring ways to beat the big freeze. He said 2,000 tons of iron ore was being loaded daily onto trucks, antifreeze was being used to stop the minerals icing up and coal was being transported by train.

"We are functioning. Even if there is a freeze, we are working," Panait said from Constanta.

However, shippers were complaining that authorities were not doing enough to ease the situation.

"People are trying to break up ice by themselves, which makes it more difficult. When you have ice flows that are 5 to 7 meters (16.5 feet to 23 feet) you need to coordinate to unblock it," said Constantin.

At a ferry crossing in southern Romania, one shipowner was frustrated by the situation.

"Authorities don't have the resources to help us clear the ice and we are left in the hands of fate," shipowner Caius Iliescu said as he struggled to dislodge his iced-locked ship near the village of Chicui.