Board Thread:General Discussion/@comment-75.95.152.62-20130804103226/@comment-6881629-20130804121926

Its called Telvannis (or Port Telvannis) i think. The only 100% official information is that its the capital of House Telvanni (along with Sadrith Mora).

The mod called Tamriel Rebuilt wanted to add it to Morrowind (the game) and they have made a marked map but that may or may not be cannon.