What is "millbay"

Millbay, also known as Millbay Docks, is an area of dockland in Plymouth, Devon, England. It lies south of Union Street, between West Hoe in the east and Stonehouse in the west. The area is currently subject to a public-private regeneration creating new homes, business premises, marina, a 1000-pupil school and opening up the waterfront to greater public access.