Question: Where are Redwook Creek and Muir Woods National Monument located?
Context: Elizabeth Thacher Kent (September 22, 1868 – August 14, 1952) was an environmentalist and women's rights activist.  Together with her husband, U.S. Congressman William Kent, she helped create the Muir Woods National Monument by donating land to the government.  She was the president of her local chapter of the Women's International League for Peace and Freedom. Mojave Trails National Monument is a U.S. National Monument located in the state of California between Interstates 15 and 40.  It partially surrounds the Mojave National Preserve.  The focal point of the new preserve is the remote and nearly pristine Cadiz Dunes that formed from the sand of dry lake beds.  It was designated by President Obama on February 12, 2016 along with Castle Mountains National Monument and Sand to Snow National Monument.  It is under the control of the Bureau of Land Management. Redwood Creek is a short but significant stream in Marin County, California.  4.7 mi long, it drains a 7 sqmi watershed which includes the Muir Woods National Monument, and reaches the Pacific Ocean north of the Golden Gate at Muir Beach. Muir Woods National Monument is a unit of the National Park Service on Mount Tamalpais near the Pacific coast, in southwestern Marin County, California.  It is part of the Golden Gate National Recreation Area, and is 12 mi north of San Francisco.  It protects 554 acre , of which 240 acre are old growth coast redwood ("Sequoia sempervirens") forests, one of a few such stands remaining in the San Francisco Bay Area. Devils Postpile National Monument is located near Mammoth Mountain in eastern California.  The national monument protects Devils Postpile, an unusual rock formation of columnar basalt.  Devils Postpile National Monument encompasses 798 acres and includes two main tourist attractions: the Devils Postpile formation and Rainbow Falls, a waterfall on the Middle Fork of the San Joaquin River.  In addition, the John Muir Trail and Pacific Crest Trail merge into one trail as they pass through the monument.  Excluding a small developed area containing the monument headquarters, visitor center and a campground; the National Monument lies within the borders of the Ansel Adams Wilderness. Redwood Creek Native Plant Nursery is just outside the old-growth redwood forest at Muir Woods National Monument.  The nursery provides plants for restoration of the creek bank in the lower watershed and impacted areas of the Muir Woods’ redwood understory. The Mount Tamalpais & Muir Woods Railway was a scenic tourist railway operating between Mill Valley and the east peak of Mount Tamalpais in Marin County, California, covering a distance of 8.19 mi , with a 2.88 mi spur line to the Muir Woods.  The railroad was incorporated in January 1896, and closed in the summer of 1930.  Originally planned as a standard gauge electric trolley line, the railroad was powered by a succession of geared steam locomotives. Billed as the "Crookedest Railroad in the World," the line was renowned for its steep and serpentine route, winding through picturesque terrain to a mountaintop tavern providing first class hospitality and striking views of the San Francisco Bay Area.  Despite its popularity, the railway met its demise following a fire in 1929, and dwindling ridership when the automobile could finally drive to Tamalpais' summit. William Kent (March 29, 1864 – March 13, 1928) was an American who served as a United States Congressman representing the State of California.  He spearheaded the movement to create the Muir Woods National Monument by donating land to the Federal Government for the Monument. Mount Tamalpais State Park is a California state park, located in Marin County, California.  The primary feature of the park is the 2571 ft Mount Tamalpais.  The park contains mostly redwood and oak forests.  The mountain itself covers around 25000 acre .  There are about 60 mi of hiking trails, which are connected to a larger, 200 mi network of trails in neighboring public lands.  The park received 564,000 visitors in as of 2003 .  Muir Woods National Monument is surrounded by the state park. John Muir ( ; April 21, 1838 – December 24, 1914) also known as "John of the Mountains", was a Scottish-American naturalist, author, environmental philosopher, glaciologist and early advocate for the preservation of wilderness in the United States.  His letters, essays, and books describing his adventures in nature, especially in the Sierra Nevada, have been read by millions.  His activism has helped to preserve the Yosemite Valley, Sequoia National Park and many other wilderness areas.  The Sierra Club, which he founded, is a prominent American conservation organization.  The 211 mi John Muir Trail, a hiking trail in the Sierra Nevada, was named in his honor.  Other such places include Muir Woods National Monument, Muir Beach, John Muir College, Mount Muir, Camp Muir, Muir Grove, and Muir Glacier.  In Scotland, the John Muir Way, a 130-mile-long route, was named in honor of him.
Answer: Marin County, California