Great Totham is a village and civil parish in Maldon district, Essex, England, and midway between Chelmsford and Colchester. The village includes the Island of Osea in the Blackwater estuary and is separated into two parts, north and south. The north side and the south side are about a mile and a half apart, distributed along the B1022. The parish contain…Great Totham is a village and civil parish in Maldon district, Essex, England, and midway between Chelmsford and Colchester. The village includes the Island of Osea in the Blackwater estuary and is separated into two parts, north and south. The north side and the south side are about a mile and a half apart, distributed along the B1022. The parish contains the hamlet of Totham Hill.