Isobu, also known as the Three-Tails, is a tailed beast in the Naruto series. Known for its formidable power, Isobu is a giant turtle-like creature with the ability to produce coral. It was once sealed within the ninja Rin Nohara. Isobu plays a crucial role in the series as a part of the Tailed Beasts, entities of immense chakra that are central to various power struggles. Throughout the series, Isobu's interactions with humans highlight themes of control, power, and the nature of true strength.