I have to apologise, it is the Monria Hub. I set out from the Main Crater Teleporter heading E.
I was exploring & wondering if more powerful mobs could be found towards the edges of the Crater.
I was climbing to the rim & saw a road to a mine entrance & a building - I thought I was still bearing more or less eastwards but actually heading NE now.
The mine entrance seems just eye candy (I think) go inside it & you get stuck & can only escape by pressing T ( you cannot use a TP chip as message comes up "something is jamming it).
I placed a way point on the mine entrance & when I was teleported to the nearest TP site (Cave 1 TP) I then TP to the Hub & looked at the map.