I was very close. You seem to describe the bottomless pit between grassy fields and the red forest, where the large waterfall cliff is. My guess was closer to the starting location. IIRC the starting point for grassy fields is on the bluff near the pond. If you jump down the bluff, there’s three normal iron nodes in a valley where most people build their first starter bases… North is four impure nodes in a different Valley. Which is the location I was thinking. If you go east from there, to the valley that runs north, and turn north, towards the red forest and walk for about a minute or two, you get to the bottomless pit, where the cliff is, that you need to climb to get to the red forest.

I love grassy fields, it’s a great place for iron and copper production. There’s a few ponds just deep enough for water extractors and a pressure well for water as well, and there’s two coal nodes of you want to get steel… Two pretty good caterium nodes towards long beach, and even sulfur not far from one of the coal nodes for noblisks.

“Good enough” levels of limestone for concrete, and you have a pretty decent starting location. You don’t need to leave the biome to build through most of the early to mid milestones, right up until you hit oil… Then you’re SOL. You have to head to Blue crater, long beach, or up to the spire coast (north, middle of the map) to find oil.

I usually venture out to the coal area where there’s a lake, just Northwest of grassy fields once I get coal, since it makes a great coal generator plant and it’s nearby, so not much in terms of running power lines across the country side before you get advanced power, and power towers.

That usually sets me up for power until I get to oil, when I head up long beach. The four oil nodes there (2 pure, 2 normal) are good for power (and plastic from the polymer resin), especially if you use the heavy oil residue alternate… Since those nodes are kinda far from everything, I just use regular fuel.

So those areas I know pretty well. I can tell from the trees that it’s close to there, the density and type of trees is pretty specific to that area in the south west…