My starting base was a bit south of the Executioneers Cave, i think it is refered 2 as “Turtle Bay”, lush well placed amid easy 2 access resources with the exception of black ice and star metal a bit close 2 the “noob river”, but a nice mountain thats hard but not impossibe 2 climb - not much people can do it and of those even less are interested of actually doing it. The T1 base stood 4 quite a while on a PvP server, probably much longer if i hadnt placed it so blatantantly on the cliff (although watching rading parties from atop going 2 the river and up 2 the arena was amusing), there is room 2 hide it even deeper in the mountains making it a fairly hidden and unassailable positon with access 2 puffball mushrooms on one of the bay’s isles, raining down clouds of death from above 2 discourage wanna-B attackers but accessing it can get on one’s nerves.
Personally i had bad experiences with the jungle - there are nice locations especially in the ruins wich offer many easily walled off locations (maybe - just maybe the witch queen’s lair shouldnt be as easily walled off, being a story keypoint and all and normally always walled in). The purges feature many poisonous monsters and even the smallest are wearing on any thralls and beasts set up 2 guard a location constantly till the big hitters arrive and that in waves… if you play such as not 2 trigger it its a nice area especially offering gold in vast ammounts from the many shipwrecks and thusly exotic pets from the pirates 2 buy - if you like spiders 4 example because archers are constantly picked off 4 their gear.
On Siptah i had good experiences with an mountainous area called “The Claws” which offers many ridges and cliffs 2 hide your base in fairly close proximity 2 the storm.
But probably the best one is in the Valley of Kings, a bit west of the Shattered Spings, just a rockthrow away by heavily travelled routes and 4 the most part entirely bypassed by most players - in essence a bit of a hidden pocket. People love 2 build teleporters at the springs 4 easy access 2 brimstone and people hate teleportes being walled off, so very, very probably there is a teleporter there which is used by half the servers population. From there one can easily teleport far into the north to the Temple of Frost, givng access 2 black ice and star metal and 4 the same logic people like 2 build an open teleporter there as well commonly (usually walled off but usually blasted open), your very own connection 2 the servers rapid transport system. Its decently close 2 the oasis and the caves there 2 mine crystal and close enough 2 travel up north through the mountain pass up the river into the outskirts of the north 2 mine demon blood and dragon bones. Its a very sweet spot and if i hadnt raided the decaying vaults of a mayor clan after a timing slipup i could have stayed there quite a while… well… most stories are best forgotten ^^