Finnish ferry runs aground in Baltic with nearly 430 aboard
The Viking Line's "Grace," sailing between the Finnish port of Turku and the Swedish capital Stockholm, hit rocks around 1415 pm (1215 GMT) shortly before a stopover in Mariehamn, in the Aland archipelago, Finland's coast guard said.
It said the cause of the accident was not immediately known but there were powerful winds in the region.
"There is no water leak and no immediate threat" to passengers, the coast guard said on Twitter.
Aboard the vessel were 331 passengers and 98 crew, a Viking Line spokeswoman told AFP.
"The passengers will have to spend the night on board and disembark (Sunday)," the spokeswoman said.
"The ship's situation is stable. On Sunday we will tell the passengers which ship they can take to return to Sweden and Finland."
Divers were inspecting the hull to determine how to put the ship back in operation.
"The situation on board is calm and a dinner is being served," the company told AFP around 1700 GMT.
Because of a storm warning, the company said it had decided to use the "Grace" instead of a smaller, less sturdy vessel.