This volume is the first in a series which reports on the multi-period site at Mucking, Essex. The excavations lasted for 13 years, from 1965 to 1978, and covered an area of over 18 hectares. This first part of the publication consists of an atlas of the site, together with a short report. The atlas is presented, at a scale of 1:180, on 25 plans which are unphased and include all investigated features; the reader will be able to join the plans and view larger areas and enclosures. The short text which accompanies the atlas consists of a brief history of the excavation and its aftermath, a series of period summaries, and a number of specialist reports which relate to the site as a whole, eg geology and cropmarks. The site atlas plans form an indispensable source of reference for the individual volumes on the various periods represented at Mucking which will follow.