That's not overly interesting.
Flatness: I find mountains more interesting (despite the slightly slower speed), and there are many maps with only two z-levels, which is close enough.
Almost no lag: probably because of flatness, and because you just started. I assure you, when you get over 100 dwarfs it won't be much faster than any other map with over 100 dwarfs.
Water: Brooks are actually quite common.
Trees, plants: Almost every non-freezing playable map has these.
Magma: Not as common as water, flora, and flatness or almost-flatness, but not overly uncommon, especially if you use Regional Prospector to look for the underground magma.
Obsidian: Any location with magma has obsidian.
No hostile creatures: Many people think hostile creatures are a GOOD thing. They keep the map interesting.
No elves: They give you free cloth. And a source of entertainment. Another negative.
Maps like these are a dime a dozen, if you'll pardon the much-overused phrase. Sand, iron, and flux would make it a bit better, but I'll wager almost every map would have at least one of those.
Of course, even a map with every "standard" feature (steel, underground water, magma, HFS, undead, sand, chasm, etc.) isn't that hard to find if you look hard enough. Hell, the Wiki has at least ten maps that claim to have "all major feature" or "almost every feature." The REALLY interesting maps are those locations with the one-in-a-million acts of nature, the "act of Armok" geological features. You know what I'm talking about. Skeletal elephants riding Giant Cave Spiders? Boring. A mountain plateau shaped like Che Guevara's head? Now THAT'S an interesting map.
Until someone finds a Mt. Guevara, though, this one is still pretty cool. No, it doesn't have flux, (and not much iron to speak of either, though there's plenty of materials for bronze making), the only soil is on the far side of the lake, and there are no skeletal elephants riding Giant Cave Spiders. On the other hand, there are TWO things that make it unique:
1. There is an ISLAND formed by several rivers and a lake. All the fun of an inpregnable fortress, while still allowing elves for your torture chambers.
2. There's an aquifer. BELOW the rock layer. Not off to the side and down a bit, but DIRECTLY BELOW the rock layer. I can't remember whether this is a programming impossibility or not, but I've never seen something like this anywhere else, and in any case, it offers all the fun of an infite water source, without any of the problems normally associated with aquifers (there's even a bauxite tube you can use to get underneath it).
You can also toss captured goblins into the lake.
[ April 20, 2008: Message edited by: Untelligent ]