Question: How many acres is the wildlife refuge that the East River drains part of into the St. Marks River?

Context paragraphs:
St. Marks River State Park: St. Marks River State Park which opened in 2007, is the 161st Florida State Park, located about 10 miles east of Tallahassee, south of U.S. Highway 27.  The park's 2,589 acres occupy parts of Jefferson and Leon counties and act as a buffer from development for the St. Marks River.

Desert National Wildlife Refuge: The Desert National Wildlife Refuge is a protected wildlife refuge, administered by the U.S. Fish and Wildlife Service, located north of Las Vegas, Nevada, in northwestern Clark and southwestern Lincoln counties, with much of its land area lying within the southeastern section of the Nevada Test and Training Range.  The Desert NWR, created on May 20, 1936, is the largest wildlife refuge in the lower 48 states of the United States, encompassing 1.615 e6acre of the Mojave Desert in the southern part of Nevada.  This Range is part of the larger Desert National Wildlife Refuge Complex, which includes the Ash Meadows National Wildlife Refuge, the Moapa Valley National Wildlife Refuge, and the Pahranagat National Wildlife Refuge.

Fort Niobrara National Wildlife Refuge: Fort Niobrara National Wildlife Refuge is located in the U.S. state of Nebraska and includes 19,131 acres (77.42 km).  The refuge borders the Niobrara National Scenic River on the west and is managed by the U.S. Fish and Wildlife Service.  From 1879 to 1906, the Fort Niobrara Military Reservation was located on what later became refuge lands to house a garrison of the U.S. Cavalry.  After the fort was closed, the effort to preserve the region as a wildlife refuge culminated in the creation of the refuge on January 11, 1912.  The refuge also manages Valentine and John and Louise Seier National Wildlife Refuges as parts of the Fort Niobrara National Wildlife Refuge Complex.

Occoquan Bay National Wildlife Refuge: The Occoquan Bay National Wildlife Refuge is a National Wildlife Refuge located where the Occoquan River meets the Potomac River in Woodbridge, Virginia, United States.  The 644 acre site, about half of which is wetlands, was a popular tourist spot known as Dawson Beach until the 1940s, after which it was used for military research by the U.S. Army's Harry Diamond Laboratories from the 1960s to the 1990s.  When the land was purchased from the military, it was temporarily called the Marumsco National Wildlife Refuge.  The refuge was formally established and renamed in 1998, and is now managed by the United States Fish and Wildlife Service as part of the Potomac River National Wildlife Refuge Complex.

Yukon Flats National Wildlife Refuge: The Yukon Flats National Wildlife Refuge is a protected wetland area in the U.S. state of Alaska.  It encompasses most of the Yukon Flats, a vast wetland area centered on the confluence of the Yukon River, Porcupine River, and Chandalar River.  The area is a major waterfowl breeding ground, and after a proposal to flood the Yukon Flats via a dam on the Yukon River was turned down, the Yukon Flats were deemed worthy of protection.  The Alaska National Interest Lands Conservation Act established the refuge in 1980.  It is the third-largest National Wildlife Refuge in the United States, although it is less than one-half the size of either of the two largest, the Arctic National Wildlife Refuge, or the Yukon Delta National Wildlife Refuge.  The refuge is administered from offices in Fairbanks.

White River National Wildlife Refuge: The White River National Wildlife Refuge (officially Dale Bumpers White River National Wildlife Refuge) is a 160756 acre wildlife refuge located in Desha, Monroe, Phillips, and Arkansas counties in the U.S. state of Arkansas.  The refuge is managed by the United States Fish and Wildlife Service.  White River NWR borders on Cache River National Wildlife Refuge at its northern boundary.

Battle of Natural Bridge: The Battle of Natural Bridge was a battle during the American Civil War, fought in what is now Woodville, Florida, near Tallahassee, on March 6, 1865.  A small band of Confederate troops and volunteers, mostly composed of teenagers from the nearby Florida Military and Collegiate Institute that would later become Florida State University, and the elderly, protected by breastworks, prevented a detachment of United States Colored Troops from crossing the Natural Bridge on the St. Marks River.  The Natural Bridge is a one-quarter mile long stretch along which the St. Marks River runs underground, after dropping into a sinkhole.  This action prevented the Union Army from capturing the Florida capital and made Tallahassee the only Confederate capital east of the Mississippi River not to be captured by Union forces during the war.  The battle has been described as the last Confederate victory in the American Civil War, and it was the second largest American Civil War battle in Florida.

St. Marks National Wildlife Refuge: St. Marks National Wildlife Refuge is one of the oldest wildlife refuges in the United States.  Established in 1931 as a wintering ground for migratory birds, it encompasses 68,000 acres (280 km) spread between Wakulla, Jefferson, and Taylor Counties in the state of Florida.

East River (Florida): The East River is a 10 mi river entirely within Wakulla County, Florida, draining part of the St. Marks National Wildlife Refuge into the St. Marks River.

Pahranagat National Wildlife Refuge: The Pahranagat National Wildlife Refuge is a protected wildlife refuge, located at the southern end of the Pahranagat Valley and administered by the U.S. Fish and Wildlife Service.  It is situated 90 mi north of Las Vegas, Nevada in Lincoln County, Nevada.  The 5380 acre refuge was created on August 16, 1963 and is part of the larger Desert National Wildlife Refuge Complex, which also includes the Ash Meadows National Wildlife Refuge, the Desert National Wildlife Refuge, and the Moapa Valley National Wildlife Refuge.

Supporting paragraphs: East River (Florida) St. Marks National Wildlife Refuge
Answer: 68,000