What Are Leeches? Leeches are soft-bodied, elongated invertebrates with a segmented structure, similar to earthworms, but with distinct differences. While most leeches are freshwater organisms, they can also be found in terrestrial and marine environments. How to Get Rid of Leeches using salt, natural repellents, and water treatment. Discover easy, effective ways to remove leeches and prevent future infestations. Learn how to safely and quickly remove a leech, as well as how to recognize a leech and when to seek immediate medical treatment. Leeches are fascinating annelids that have captured human interest for centuries due to their unique biology, diverse habitats, and medical significance. Often misunderstood and sometimes feared, leeches play vital roles in ecosystems across the globe.