At that time marshlands extended along both sides of the Thames, but where the tide turns some 30 miles [50 km] from its estuary, the Roman army later constructed a wooden bridge.
Tol ajal ümbritsesid Thamesi mõlemat kallast ulatuslikud sood, kuid umbes 50 kilomeetrit lehtersuudmest ülesvoolu, kohta, kuhu ulatuvad looded, ehitas Rooma armee hiljem puust silla.