What role does geography play in Dracula?

Geography plays a very important role in the novel. When the action begins, Count Dracula has been isolated for many years in a remote and backward part of the world, a medieval castle in Transylvania that is difficult to travel to and from. He wants very much to get to London at the time of the story (the 1890s). It is the center of world commerce, and it is a great port from which ships traveled all over the world. It was also a center of population, a huge metropolis offering Dracula many victims.
Dracula, unfortunately, is able to get to London with some of his vampire followers and hopes from there to create more vampires. This would allow him to easily send them out all over the world.