Question: Which county has the largest portion of this forest in which Glassy Mountain is located?
Context: The Chattahoochee-Oconee National Forest in northern Georgia comprises two United States National Forests, the Oconee National Forest and Chattahoochee National Forest.  The combined total area of the Chattahoochee-Oconee National Forest is 866468 acre , of which the Chattahoochee National Forest comprises 750145 acre and the Oconee National Forest comprises 116232 acre .  The county with the largest portion of the forest is Rabun County, Georgia, which has 148684 acre within its boundaries. The Albany County, New York, Department of Public Works maintains nearly 290 mi of roads and 78 bridges as county routes. All county routes in Albany County are signed with a blue pentagonal shield, the Manual on Uniform Traffic Control Devices' standard shield for county routes.  Although quite a few county routes are in more than one town, the route number reflects the town that the largest portion of the route is in.  Two county routes pass though the western portion of the city of Albany.  Parts of New York State Route 32 (NY 32) and NY 155 are owned and maintained by Albany County and are thus co-signed as state touring routes and as Albany County routes. Midland Charter Township is a charter township of Midland County in the U.S. state of Michigan.  The population was 2,297 at the 2000 census.  The largest portion of the City of Midland is located within the boundaries of the survey township, but is administratively autonomous of the civil township.  The township consists of non-contiguous segments adjacent to the city. The Southwestern Proving Ground Building No. 5 is an ammunition storage bunker at 259 Hempstead County Road 279 in Oakhaven, Arkansas, northwest of the city of Hope.  It is located on property that was once part of the Southwestern Proving Ground, a major military facility during World War II whose largest portion was transformed into Hope Municipal Airport.  Building No. 5 is a single-story concrete structure with a rounded roof, covered in earth, and with a heavy steel door facing northwest.  It is one of three ammunition bunkers built on the proving ground (the others, Building Nos. 32 and 33, also survive).  The building is used as storage by a private owner. Stripe Mountain is the highest point in both the South Clearwater Mountains and the Clearwater Mountains as a whole, part of the Bitterroot Range and Rocky Mountains in the panhandle of Idaho in the Western United States.  Its summit is at an elevation of 9001 ft and the mountain's ridgeline forms the boundary of Idaho County and Lemhi County.  The Idaho County portion of the mountain lies within the Bitterroot National Forest and the Lemhi County portion of the mountain lies within the Salmon-Challis National Forest, and the entirety of the mountain lies within the Frank Church-River of No Return Wilderness Area. Manitoba's Duck Mountain Provincial Forest is located in the western part of the province.  The forest contains all of Duck Mountain Provincial Park, plus peripheral areas around it.  The largest portion of the park and the forest are located in an unorganized portion of Census Division No. 20, but substantial portions of the forest lie in surrounding Rural Municipalities, including Ethelbert, Hillsburg, Grandview, Swan River, Minitonas, and Mountain. The Tallulah Ranger District is one of the five ranger districts of the Chattahoochee National Forest.  The largest portion of the district is located in Rabun County, Georgia, which contains nearly 149000 acre .  A portion of the Tallulah Ranger District is also found in Towns County.  Both the Appalachian Trail and the Bartram Trail are located in the district. Glassy Mountain is a mountain in the Chattahoochee National Forest in Rabun County, Georgia, with its USGS GNIS summit at , which is 3415 ft AMSL.  It is bypassed on its northern flank by a major two-lane highway that carries U.S. Route 76 and Georgia State Route 2 east and west. The Southwestern Proving Ground Building No. 129 is a military powder magazine at 195 Hempstead County Road 279 in Oakhaven, Arkansas, northwest of the city of Hope.  It is located on property that was once part of the Southwestern Proving Ground, a major military facility during World War II whose largest portion was transformed into Hope Municipal Airport.  Building No. 129 is a single-story brick and tile structure, with two bays.  There are red steel doors located on the northeast and southwest facades.  The roof is gabled, and covered in fire-resistant asbestos sheeting, with vents at the ridge, and an elaborate lightning-protection system.  It was built in 1941 to house smokeless gunpowder, and is one of only two brick buildings from the proving ground to survive.  It is now used by a private owner for storage. The Apache-Sitgreaves National Forest is a 2.76 e6acre United States National Forest which runs along the Mogollon Rim and the White Mountains in east-central Arizona and extending into the U.S. state of New Mexico.  Both forests are managed as one unit by USDA Forest Service from the forests Supervisors Office in Springerville, Arizona.  Apache-Sitgreaves has over 400 species of wildlife .  With its high elevation and cool summer breezes it is a popular weekend destination from the hot desert for Phoenix, Arizona residents.  The forest is divided into 5 Ranger Districts (Clifton, Alpine, Springerville, Lakeside, and Black Mesa) that span almost 300 mi from Clifton, Arizona in the east-central portion of Arizona to the eastern boundary of the Coconino National Forest in north-central Arizona.  The Apache-Sitgreaves National Forest borders the western and northern borders of the Fort Apache Indian Reservation.  It is located in parts of Greenlee, Apache, Navajo, and Coconino counties in eastern and east-central Arizona, and Catron County in western New Mexico.  The more northwesterly Sitgreaves National Forest portion lies adjacent to the north side of the Fort Apache Indian Reservation and is located entirely in Arizona, within Navajo, Apache, and Coconino counties.  It has a total area of 818,651 acre .  The more southeasterly and much larger Apache National Forest portion lies adjacent to the east side of the Fort Apache and the San Carlos Indian Reservations.  It lies on both sides of the border with New Mexico, in Greenlee, Catron, and Apache counties.  It has a total area of 1,813,601 acre .
Answer: Rabun County