 At the southern extremity of the island, near the salt flats, are some hard-to-reach, mostly unspoiled beaches.
The southern end of the island has only swamps along the coast, and no beaches.
mnli hypothesis: The southern end of the island has only swamps along the coast, and no beaches. premise:  At the southern extremity of the island, near the salt flats, are some hard-to-reach, mostly unspoiled beaches.