Originating from East Kalimantan, the legend of the Mahakam River Dolphins—Pesut Mahakam—has been passed down through generations. At the heart of the story are two siblings who, after plunging into the Mahakam River, were transformed into the gentle irrawaddy dolphin dolphins that now symbolize the region. The legend reflects the community’s intimate relationship with the Mahakam River and its wildlife. It conveys themes of transformation, kinship, and respect for nature—values that continue to shape the cultural identity of the people of Kalimantan.