Seed: 19860728 (Coincidentally, this is my birthday, which is why I tried it.) IIRC, you'll get this map after 13 rejections.
The area is.. one second, let me find it again. I'll have to create a duplicate copy of my DF folder so I can abandon the fort to get on to the world map..
Okay. The World segment you're looking for is third from the top, ninth from the left. It's a grey mountain square.
The region segment is at the intersection of two brooks and a river (it looks like a four-way, in reality it's two brooks and a river taking a curve) that looks ALMOST like a swastika.
The brooks are 'Skunkmelted the Breach of Vegetation' (huh?), 'The Whiteness of Tongs', and the river is 'The Illness of Pointing'. What you want is the grey mountain above and to the left of the intersection in the three-tile mountain range named The Horns of Paging.
You're going to see a magma vent, the river, and the forest if you've got the right square. The forest and magma vent are both in the upper right.
I made my fort 8x8; I realize this is pretty darn big, but you could easily squeeze the magma vent, the neat amphi-lake, and the river into a much smaller map segment that would also include the forest by necessity.
I would like to request that nobody posts any spoilers for this map, please. I don't use reveal.exe on my maps, and I don't want to know what goodies (or baddies) are buried here until I stumble on them myself. Of course, posting fortresses you build on to the map archives doesn't count.