Xandra (yes, that is a real name) is a Xenopus (yes, that is a real animal genus) who has taken up residence in Springfield for your caching, and Alphabet Challenging pleasure. The Xenopus is a permanent cache fixture so please do not attempt to remove.
You can get close to GZ by following the track which is visable on the satellite view of the area. The track runs roughly North-South and you can approach from either direction. It can get quite muddy after rain so best not attempted at such times. Also be sure to take water and bug repellent.