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Boston Mayor Martin J. Walsh is calling for an expansion of public park space — like the Harborwalk — along the city’s waterfront. –Wendy Maeda/Globe file photo

Boston could soon be getting to work on a signature park along Fort Point Channel.

Mayor Martin J. Walsh Wednesday outlined plans to put a “landmark new green space’’ along the downtown waterway, linking Fort Point, Chinatown and South Boston with a string of islands, marshes and pedestrian bridges he said would be a “new jewel in our park system.’’

The city will partner with the Trustees of the Reservations, which has been working for two years to design a signature new park on Boston’s waterfront. Together they plan to “reimagine’’ the old industrial channel — where General Electric is building a gleaming new headquarters, but which is also lined on one side by Gillette, and on the other by a huge US Postal Service distribution facility — turning it into a space that would draw visitors from across the city while sparking new development nearby.