There’s one at the bottom but it wouldn’t be contiguous. So I went with the smaller drop, which would be both vertical, i.e. due south, and contiguous.
You could argue that it falls down the highlighted name if it goes NW-SE, but a) it’s a stretch to call it vertical, and b) the highlighting would then be a straight line. I would thought the preamble would have said that if it meant that. Contiguous usually meant connected but not straight, in my book