I want to make an rpg that uses both the ice world, and the ashlands terrain and i am wondering if this is possible with any editor or program out there.

Not possible without a mod, and mods don't work over b.net. Plus, you'd have to make the mod yourself.
ok thx... thats really disappointing tho. are u sure u cant use one over b.net?
Think of it this way;
Computer 1(your comp) tells Computer 2, 3, and 4(other plays) that you 200 damage Marine with a short-range laser has just killed 3 Ultralisks that have 5 damage and 200 HP and long range, and the other computers are like "WTF is wrong with you?!"
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thats really disappointing tho. are u sure u cant use one over b.net?
You can if all players are running the same Patched MPQ (mod)
mods are good for lan games, or something where oyu know everyone. and gave them the mod ahead of time.
I'm not 100% about this but I think that a single person can run just a mod done in tbledit, (like just text) and not have starcraft crash. I could be wrong though.
If you want to make 2 terrains in one map, your best bet is Badlands which is somewhat a hybrid between space and jungle. Works well for colors on Bounds, not sure how it'd work for an RPG depending on what type you're making.
Or unless you are some super nerd and can modify the original starcraft of yours and others to work with MOD's...
EDIT:I didnt even know MOD's worked on LAN, I didn't even know they worked over the net at all!

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mods are good for lan games, or something where oyu know everyone. and gave them the mod ahead of time.
I'm not 100% about this but I think that a single person can run just a mod done in tbledit, (like just text) and not have starcraft crash. I could be wrong though.
If it changes the MPQ, which changing \rez\stat_tbl.tbl does, ti can't be compatibally though SCM transfer.
well this is kind of late but mebbe try to just place a doodad from the ashworld terrain to get the effect.
The doodad will get messed up because it's an actuall psysical thing.
Try using sprites like I did in one of my maps. If done correctly you can get the effect that you have 2 or more terrains.
yeah. what i found funny is that i put tree terrain like on jungle ( a regular tree base) and then put a snow tree on that base. it was kinda funny.