From the point of the most northerly intersection of the meridian of Longitude 141 East with the waterway (‘thalweg’) of the Fly River (at present located at Latitude 6 19’ 24’’ South) the boundary lies along that waterway to the point of its most southerly intersection with the meridian of Longitude 141 01’ 10’’ East (at present located at Latitude 6 53’ 33’’ South).