Black Marsh... Argonian land lol

Here is the lore.. It does say that Solstheim is the only Dark Elf land.. Getting to Solstheim would require going through land belonging to the Argonians or taking a boat through water that have icebergs..
The abolition of slavery improved relations with Morrowind, but Argonians did not forget the transgressions of the Dark Elves. The ramifications of the arrival of the http://www.uesp.net/wiki/Lore:Nerevarine
, especially the loss of their http://www.uesp.net/wiki/Lore:Tribunal
, left the Dunmer very weak at the beginning of the http://www.uesp.net/wiki/Lore:Fourth_Era
, and the Argonians had emerged from the http://www.uesp.net/wiki/Lore:Oblivion_Crisis
more unified, stronger and ambitious than ever before.http://www.uesp.net/wiki/Lore:Argonian#cite_note-TIC-0http://www.uesp.net/wiki/Lore:Argonian#cite_note-Morrowind-13http://www.uesp.net/wiki/Lore:Argonian#cite_note-Oblivion-14 Taking advantage of the eruption of Red Mountain that weakened Morrowind, they successfully and ruthlessly invaded mainland Morrowind, driving the remaining Dunmer out of their ancestral homeland and onto the small island of http://www.uesp.net/wiki/Lore:Solstheim
and across Tamriel.