Marden Fields covers 179 acres/72 hectares to the South East of Tewin village and lies within the lower Mimram Valley between Tewin, Marden Hill and Welwyn Garden City. It is also known as Tewin Grove (a developer’s name) and Tewin Plotlands.
The geographic features of the area can be found on the Ordnance Survey Explorer Map no. 182 – St Albans and Hatfield 1/25000 scale and Google Earth.