Anderson Marsh sits at the southern end of Clear Lake where Cache Creek enters the lake, preserving tule marsh, oak woodland, and grassland habitats in a largely undisturbed state. More than 160 bird species have been recorded here, and the wetlands support significant populations of egrets, herons, and wintering waterfowl.
The trail system is modest — a few kilometres of easy walking — but the combination of habitat variety, wildlife, and the ranch buildings from the 19th-century Anderson Ranch make this the best single stop in Lake County for visitors who are not here primarily to fish. Entry is inexpensive and crowds are thin outside summer weekends.