Effectively, filled in the space between the two current continent designs to create a 3rd continent.
There are certain parallels between one of the big continent's coasts and that of your own design, give or take a slight deviation accounted by volcanism / plate collision. By tracing these parallels then filling in the blanks, this 3rd continent was the result.
I know we're doing the whole magic bit but there's no harm in employing a bit of science, no?
