Jallarka is the island that Deadpool and Bob, Agent of Hydra wanted to rob when they became pirates. However, upon meeting the blind woman Kalani,
Deadpool had a change of heart and realized he liked helping people. He dumped Bob on the island but gave him some money to make it back to his home.
Deadpool visited the island in the following comics:
Deadpool #13-14 (volume 3)