A Devon dock is to receive a £4m investment so it can accommodate a new "superferry".
The Val De Loire will be replaced with the Pont Aven ferry
Work is about to begin at Plymouth's Millbay Docks to enable it to take the Pont Aven.
It will be the largest vessel in Brittany Ferries' fleet when it is accepted into service.
It is hoped the new superferry will be operational between Plymouth and Spain by next April.
Ferries have crossed between Plymouth and the continent since the early 1970s.
This is excellent news for the future of Plymouth
Nick Palmer, Associated British Ports
About 600,000 people a year take the ferry from the South West to Spain or France.
The Pont Aven will replace the current service offered by the Val De Loire.
But in order to accommodate the new ferry, the whole area of Millbay Docks must be expanded.
Dredging will take place on the marine side, with new dockside buffers installed on the land side.
The bigger ferry should see a substantial increase in the number of people passing through Plymouth, providing a boost to the city's economy.
It will also help secure Brittany Ferries' future in Plymouth.
Nick Palmer, of Associated British Ports, said: "This is excellent news for the future of Plymouth.
"It has become an established ferry port over the past 30 years, with Brittany Ferries running services out of the area.
"The new development will add to capacity within the port, but the new ship coming onto the route will provide enhanced services."