The bund is a special man-made island district, also known as Tokyo Landfill #0, floating in the Tokyo harbor. Mina Tepes specially built the Bund as a safe haven for all vampires, particularly the fangless vampries.
About the Bund
Vampires are the primary civillians living in the bund, however Mina's werewolf guards, Beowulf, also live there fulltime for her protection. The tallest building on the Bund is Mina's "castle", where she, Vera, Alphonse, Nelly, Nero, Nella, Nanami, Yuzuru, Akira and the Beowulfs live; the castle also holds the Beowulf headquarters as well. Humans of great significance, either politically or through personal relationship to Mina, are allowed to visit the Bund; they lodge at the castle not only because such, but because its the safest place from less friendly vampires. The only connection from the mainland to the Bund is through a single underground tunnel. The island has no bridges or major ports.
There is also a church, primarily for the Fangless that retained their beliefs; marriages are also held here. It is run by a vampire priest who appears to be stuck between human and true form, given his pointy ears and large teeth.
During a press conference Mina reveals that she obtained the island through paying of the Japanese deficit of ¥100 quadrillion ($8.2 billion) with the vast wealth of the Tepes family. The island is only leased by Mina, however there are no terms on the lease and that she maintains full administrative and policing authority, much like a Concession Territory rather than a lease. It is a territory within Japan, but not part of Japan, allowing the different human and vampire cultures to mix and mingle, yet remain separate.