The sand dunes provide a place for campers and dune buggy enthusiasts. Dunes have a vortex in the lee side of the dune. Complex dunes are combinations of two or more dune types. They are associated with sand dune migration. The bulk of the sand in the dune migrates forward. On many of the protected bay shores, wetlands and dune ecosystems dominate the land. The village is in the center of a stretch of coastal dune lakes. The lagoon and tidal flat area is located behind the dune and backshore area. Tatooine is similar to the desert planet of Arrakis from Frank Herbert's "Dune" series. The mushroom has an affinity for coastal dune grasses. Projects attempted to replicate the protective characteristics of natural beach and dune systems. Ganesa Macula may be an eroded impact crater with a dark dune in the center. The allegoric sandbar helps reduce erosion of the dune (or people). In "Dune", this concept is represented by the sandworms. Water also plays a role in dune formation.