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Viking Cruises has increased its order for new Viking Longships from 12 to 14 in a bid to meet growing river cruising demand.

According to the cruise line, river cruising has had an average annual growth rate of nine percent over the last few years. Viking has also grown by an average of 22 percent per year, compared to an estimated four percent annual growth of its competitors.

Due for delivery next year, the new ships will be used on popular European itineraries.

Viking Longships accmmodate 190 passengers in 95 staterooms. They also have sustainability upgrades, such as onboard solar panels, organic herb gardens and energy-efficient hyrbid engines.

By the end of 2014, Viking would have introduced 30 new ships in a three-year period.