All those areas in the North Auckland and South Auckland Land Districts bounded by a line commencing at the south-eastern corner of Waihi North Survey District and proceeding westerly along the southern boundaries of Waihi North, Ohinemuri, and Waihou Survey Districts; thence northerly along the western boundaries of Waihou and Thames Survey Districts to the Firth of Thames; thence northerly and southeasterly generally along the sea coast to the point of commencement; together with Great Barrier Island, Little Barrier Island, Cuvier Island, Great Mercury Island, Red Mercury Island, The Aldermen Islands, Mayor Island, and all other islands adjacent to the said areas or the said islands.