From the Super Mario Wiki, the Mario encyclopedia
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The Reef is the second world in the Donkey Kong Adventure mode of Mario + Rabbids Kingdom Battle. It is a sandy beach area consisting of many coral tubes and sand.
Following Side Eye's defeat, Donkey Kong and co. travel to the Reef to find the second temple key, eventually reaching Finn. After defeating Finn and acquiring the second key, the group places both keys into the temple door in order to gain access to the Jungle, thus revealing their next destination.