Dibella's Watch adds an entire new continent to Oblivion. It comes complete with a major city, castles, towns, villages, farms, monasteries and all the good stuff that makes up a Medieval landscape. There's also fighting to be had and quests to be made!
Port Zerrva is where you enter the Continent. In this screenshot the idyllic small town of Port Zerrva is seen at the bottom left of the screen, while the City of Dibella's Watch is towering in the background. The City makes for an excellent photo model. She's pretty, huh?