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This page is about the location. For the quest with the same name, see Oasis (quest).
Icon settlement medium
Oasis loc
map markerOasis
leadersTree Father Birch
cell nameOasis01 (gate)
OasisCave01 (sunken chambers)
OasisCave02 (damp cave)
OasisCave03 (caverns)
ref id000012c1 (gate)
00017e18 (sunken chambers)
00017e19 (damp cave)
0002a58a (caverns)

If anything, this place will become a memorial to Him lest we may forget.

Tree Father Birch

Oasis is a settlement in the Capital Wasteland which is unusually full of trees and green plants. It is located north-west of Clifftop shacks and north-east of Broadcast tower LP8. Birds can also be heard singing once inside the gate, suggesting that animal life has been flourishing here. It must be entered from the northwest.


Oasis was originally a mine, but after the Great War it became just another part of the wastes. That was until Harold and Bob, a uniquely mutated product of the Forced Evolutionary Virus (or FEV), arrived. Harold hosted a tree growing from his head which he likes to call Bob and at times "Herbert" because, as he says, "Bob hates it". The grafted human and tree eventually found themselves overwhelmed by Bob's plant needs and became rooted to the ground ending their travels through the Capital Wasteland region sometime after 2241. Here, They were discovered by several people who began to worship Harold as a god. These few grew to be a small and sometimes exclusive cult known as the Treeminders. These dogmatic few began to form, in secrecy, a full religion. Bob began to blossom (which Harold apparently finds embarrassing), and many plants grew in this area, which became green with life, a stark and dramatic contrast to the rest of the wasteland.

When the player character arrives he or she is urged to talk to Harold. After a "cleansing ritual" held by the Treeminders, the player character meets with Harold. After learning his history, the player character is given the option of either killing him, increasing his fertility, or slowing it down. Strangely, if you chose to shoot Harold, he spontaneously combusts. This is the main plot/quest element for Oasis, and each choice has its own repercussions with the Treeminders and can affect the player character's Karma.


Oasis is situated almost at the top center of the map. It is surrounded by steep cliffs, and can be entered only through a small gorge by traveling west to east. The entrance is small and can be easily missed; use the compass for assistance.


Notable lootEdit

Sunken chambersEdit

As you enter in sunken chambers, turn left and up in a small room you will find:

At the bottom of the northern pond you will find:

  • 1 mini nuke, underwater, on a rock near the middle of the pool.
  • Past the northern pond, at an intersection marked by green glowing fungi, there is a Stealth Boy located on top of one of the 2 ammo containers.

Damp caveEdit

On land, continuing around right side of cave you will find:

Related questsEdit


  • Three Dog will make a mention of a tree-filled place in the Capital Wasteland in one of his news items, although he admits he "may have been experimenting with jet" at the time.
  • In the grove where Harold is, it is possible to get behind the gates leading into the center of Oasis.
  • Coordinates to Oasis can be gained via the drifter at the Dickerson Tabernacle Chapel, or either the Oasis Merchant or Oasis Raiders 'Type A' random encounters.
  • Unlike most settlements where provoked residents will stop fleeing and attacking after holstering your weapon, the residents of Oasis will remain permanently hostile after being attacked the first time.
  • All human residents of Oasis have horticultural names.


Oasis appears only in Fallout 3.


ps3Icon ps3 It is possible that certain dialogue options will disappear after completing the main Oasis quest, making it impossible to obtain your reward. There is no known reason for this, but it may have something to do with certain dialogue choices made prior to completion of the quest. [verified]



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