Pymme's Brook is a modest urban waterway winding through North London, originating from underground springs at Hadley Common in Monken Hadley — a hilltop village on the northern fringe of London. Named after William Pymme, a historic local landowner, the brook flows in a south-easterly direction for roughly ten miles before merging with the River Lea Navigation near Ferry Lane and Tottenham Lock. Along its course, it passes through East Barnet, New Southgate, Arnos Grove, Palmers Green, and Edmonton, picking up tributaries including the Shirebourne Brook and Salmons Brook before reaching its confluence with the Lea. As an urban stream, Pymme's Brook is heavily shaped by its surroundings — culverted in many stretches, channelized in its lower reaches, and subject to the pressures of dense development throughout its catchment. Despite these challenges, portions of the brook retain ecological value, and active community efforts are underway to restore and improve its health.