The Limulus polyphemus populations are distributed alongside the northern coast of the Atlantic Ocean between Georgia and New York. There are also smaller populations along the Gulf of Mexico. The green sea turtle also lives in the Gulf of Mexico! The most popular area for the horseshoe crabs is in the Delaware Bay. They are mainly found in shallow waters with soft ocean floors. The habitat for horseshoe crabs depends on what stage it is in, whether the horseshoe crab is spawning, breeding, or just growing to maturity. At each point in its life, the waters and substrates are important factors. Multiple organisms live in its habitat including numerous species of shorebirds, fish including striped bass, white perch American eel, weakfish, silversides, summer and winter flounders, sea turtles, many gastropods, sponges, mud crabs and sand shrimp, bivalves, flatworms, snails and many more!