Baylands & Creeks of South San Francisco Bay. This map presents both the historical and modern hydroscapes of the South Bay. One side shows in exquisite detail the salt marshes as they were prior to the gold rush. The other side presents the modern-day salt ponds and the lower reaches of the creeks in the area south of the Dumbarton Bridge. Much of this area was recently purchased for restoration of the salt ponds to natural habitat.