Colchester is the largest settlement featured on this drawing. The draughtsman has recorded the layout of the streets in red ink. On nearby Lexden Heath, an 'Ancient Intrenchment' is depicted. These lines of entrenchment date back to the Roman occupation. The drawing extends to cover Mersey Island and the River Colne. The salt marshes are distinguished by irregular patterning and the individual channels of the Colne are named. A military battery is marked at the mouth of the river, reflecting the military focus of these drawings. A blue line indicates the level of the low water mark.