From the Super Mario Wiki
Gwarhar Lagoon is a rocky, tropical resort area in the southeastern part of the Beanbean Kingdom. Mario and Luigi travel here to find a piece of the Beanstar during the events of Mario & Luigi: Superstar Saga. The Beanstar piece is found on the top of Hermie III's shell and the Bros. must battle him for it. Spangle becomes the Beanstar's replacement.
If the brothers travel to the north end of the first area of the beach, they will find Warp Pipe #8.
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