Arkham Island

Arkham Island is a small island between the mainland and Gotham City. A small bypass on the way to the city, the island is notorious for being the location of the Arkham Asylum. The island is connected to Gotham via Westward Bridge, the bridge itself runs straight through the northern segment of the island, connecting onto the Trigate Bridge, which leads across to Gotham County on the mainland.

History
Secluded from the mainland, Arkham Island was originally owned by the Arkham Family, and only contained the Arkham Mansion and the Botanical Gardens. Over the years, that further developed into becoming The Elizabeth Arkham Asylum for the Criminally Insane - an institution that was founded by Amadeus Arkham, and was named after his mother whom he euthanized here as a treatment for her dementia.

A graveyard can be found in the part of Arkham where the Arkham Mansion and Botanical Gardens are. There, Amadeus Arkham's grave can be found.