Abandoned Area

 is an area added to Fallout 3 in the add-on The Pitt. It connects The Mill and the Steelyard.

This area seems to have been constructed by the Pitt authorities to serve as a barrier between the citizens and the Trogs who live in the Steelyard.

As part of the Mill Worker achievement, three Steel Ingots are in a mine cart to the left of the Mill entrance. These particular ingots are only available after the initial ten are collected - at this point a Trog tears a hole in the fence, attacking the player and opening a way to the ingots.