The name Jacarutu is a synonym for evil. The Iduali tribe came from there. They were water stealers. The most heinous criminals under Fremen law. The first and greatest sin. But the Fremen tribes banded together to declare war on the Jacarutu. The Iduali were slaughtered. Their water spread upon the sands. Jacarutu Sietch was declared taboo. No Fremen was allowed to look for it. -- Gurney Halleck, Children of Dune