Blackwall is an area of Poplar, in the London Borough of Tower Hamlets, East London. The neighbourhood includes Leamouth and the Coldharbour conservation area. The area takes its name from a historic stretch of riverside wall built along an outside curve of the Thames, to protect the area from flooding. Along with the rest of Poplar, Blackwall has its ori…Blackwall is an area of Poplar, in the London Borough of Tower Hamlets, East London. The neighbourhood includes Leamouth and the Coldharbour conservation area. The area takes its name from a historic stretch of riverside wall built along an outside curve of the Thames, to protect the area from flooding. Along with the rest of Poplar, Blackwall has its origin in the Manor and Ancient Parish of Stepney. While mostly residential, the Poplar Dock and Blackwall Basin provide moorings for vessels.