I have totally mind blanked what is the name of the dwemer homeland I think it started with an "A"

"Dwemereth, the region that is now http://www.uesp.net/wiki/Lore:Morrowind" from UESP

Morrowind, formerly known as Resdayn, maybe something else before that

Aldmeris, according to legend this was the original homeland of all the Mer.

this except they were a slightly different type of elf at that time

According to http://www.imperial-library.info/content/nu-mantia-intercept-letter-5, Aldmeris is not a physical place, but the Mer's racial memory of the Dawn Era. Everyone started in Tamriel, then spread out, them bought their changed stories with them when they returned.