What Is That? - Jeff Zeitlin (13 Jul 2017 22:28 UTC)

Was just looking at TravellerMap, specifically Reft, in connection
with a friend's independent project, and I spotted An Oddity:

On the border between Gome and Limon subsectors, there are six hexes -
if I'm counting right, 2720, 2819, 2820, 2920, 2921, and 2922 - that
are blank, but tinted purple, with the label "The Andaluu".

What is it? And why?