Wetlands used to cover a huge swath of Southern California's coast, serving as a sanctuary for wildlife and plants. But today one is hard pressed to find many wetlands left in this urbanized section of the state, where homes, marinas and ports long ago replaced native habitat. While wide, sandy beaches and rocky tide pools are part of the Southern California landscape, quieter wetlands with estuaries, marshes and sand dunes are harder to find.

The Salton Sea sits likes a time bomb in the desert, serving up a brew of bad smells, turgid waters and the potential to increase air pollution in an area where thousands of homes are planned. But under a proposal making its way through the Legislature, some of the sea's lurking hazards may be stopped. Instead, the Salton Sea may be shrunk to a third of its current 240,000 acres and revived as a recreational lake for sport fish and migrating birds. All it will take is billions of dollars and at least 75 years of maintenance.

A new joint powers authority has acquired 66 acres of coastal wetlands at the mouth of the San Gabriel River in Long Beach and Seal Beach, and may acquire at least 100 more acres in the near future. The Los Cerritos wetlands may provide the scene for the last major coastal wetlands restoration project in Southern California.

To get some idea of how much San Francisco Bay has changed during the past two centuries, unfold a map and trace the estuary's amoeboid outline as it squeezes through Carquinez Strait into the Delta's confusion of sloughs and marshes. There, 33 miles inland from the Golden Gate but still bathed in tidewater, lie a pair of features named Grizzly Bay and Grizzly Island.