Ruta Cuarenta is a remote Togean boat dive that moves from a reef slope into a dramatic wall before easing onto sand and a gentler tail. The varied terrain gives macro hunters and reef watchers a lot to work through, with nudibranchs, shrimp, hermit crabs, and fire gobies among the small-life highlights. Plan it as an operator-run island dive with flexible timing, clear-water windows, and a setting that usually feels calmer than open-ocean sites even when the wall section picks up some movement.