Oho Ocean

From the Super Mario Wiki

The Oho Ocean is the large sea to the east of the Beanbean Kingdom. The Oho Oasis is an island in this ocean. The Mario Bros. had to dive to the bottom of the Oho Ocean during their adventure in Mario & Luigi: Superstar Saga.

It is also possible to surf there, which is the only way to get to Joke's End.

Many balloons filled with Coins dot the surface of the ocean. By jumping, the Mario Bros. can pop these, and get the Coins inside, ranging anywhere from two to ten Coins per balloon. Additionally, two whirlpools lead to Chuckle Bean-filled areas, as well as a small island where the heroes can receive a 1-Up Mushroom.

Beanbean Kingdom areas
Beanbean Kingdom | Stardust Fields | Hoohoo Mountain | Hoohoo Village | Beanbean Castle Town | Beanbean Castle | Chateau de Chucklehuck | Chucklehuck Woods | Woohoo Hooniversity | Oho Oasis | Oho Ocean | Seabed | Beanbean International Airport | Teehee Valley | Little Fungitown | Guffawha Ruins | Gwarhar Lagoon | Yoshi Theater | Joke's End