From "Savant's Note On Vvardenfell":
QUOTE
House Dres
Of the five Dunmer Great Houses, House Dres is one of two houses without holdings or interest in Vvardenfell. Dres District is in the south of Morrowind, bordering the swamps and marshes of Black Marsh. House Dres is an agrarian agricultural society, and its large saltrice plantations rely completely on slave labor for their economic viability. Always firm Temple supporters, House Dres is hostile to Imperial law and culture, and in particular opposed to any attempts to limit the institution of slavery.
House Hlaalu
House Hlaalu is one of the three Dunmer Great Houses with holdings on Vvardenfell. House Hlaalu has always been loyal to the Emperor and the Empire. Hlaalu welcomes Imperial law and the Legions, and freedom of trade and religion. We still respect the old Dunmer ways, the ancestors, the Temple, and the noble houses. But times change, and the Empire changes with the times. House Hlaalu hopes to live in peace and harmony with the other races, and share in the growth and prosperity of the Empire.
House Indoril
House Indoril is one of the five Dunmer Great Houses, and one of the two houses without holdings or interest in Vvardenfell. The city of Almalexia is located in Indoril District, and the Indoril are orthodox and conservative supporters of the Temple and Temple authority. House Indoril is openly hostile to Imperial culture and religion, and preserves many traditional Dunmer customs and practices in defiance of Imperial law.
House Redoran
House Redoran is one of the three Dunmer Great Houses with holdings on Vvardenfell. The Redoran prize the virtues of duty, gravity, and piety. Duty is to one's own honor, and to one's family and clan. Gravity is the essential seriousness of life. Life is hard, and events must be judged, endured, and reflected upon with due care and earnestness. Piety is respect for the gods, and the virtues they represent. A light, careless life is not worth living.
House Telvanni
House Telvanni is one of the three Dunmer Great Houses with holdings on Vvardenfell. The Telvanni wizard-lords have traditionally isolated themselves, pursuing wisdom and mastery in solitude. But certain ambitious wizards-lords, their retainers, and clients have entered whole-heartily into the competition to control and exploit Vvardenfell's land and resources, building towers and bases all along the eastern coast. The Telvanni think that wisdom confers power, and power confers right.
Dres and Indoril are not joinable, as they have no presence on Vvardenfell.