The River Quaggy as seen from Clarendon Rise in Lewisham.
An urban river passing through the London boroughs of Bronmley, Greenwich and Lewisham. It is a tributary of the River Ravensbourne which it meets close to Lewisham Station. In its upper reaches it is known as the Kyd Brook.
The Wikipedia page is [1]. The Quaggy Waterways Action Group page is [2] and the London Gardens Trust page is [3].