Overview
The Pool of London is a stretch of the River Thames from London Bridge to below Limehouse.
Part of the Tideway of the Thames, the Pool was navigable by tall-masted vessels bringing coastal and later overseas goods—the wharves there were the original part of the Port of London. The Pool of London is divided into two parts, the Upper Pool and Lower Pool. The Upper Pool consists of the section between London Bridge, which blocked tall-masts from continuing west, and the Cherry Garden Pier in Bermondsey. The Lower Pool runs from the Cherry Garden Pier to Limekiln Creek.
History
Originally, the Pool of London was the stretch of the River Thames along Billingsgate on the south side of the City of London where all imported cargoes had to be delivered for inspection and assessment by Customs Officers, giving the area the name of "Legal Quays". Smuggling, theft and pilferage of cargoes were rife, both on the busy open wharves and in the crowded warehouses. The term was later used more generally to refer to the stretch of the river from Rotherhithe upriver to London Bridge, with the venerable bridge being the farthest reach that could be navigated by a tall-masted vessel.
The Pool of London was of vital importance to the capital for centuries - as early as the 7th century Bede wrote that it was the reason for London's existence - but it reached its peak in the 18th and 19th centuries. By this time the river was lined with nearly-continuous walls of wharves running for miles along both banks, and hundreds of ships moored in the river or alongside the quays.
From Wikipedia (CC BY-SA 4.0).