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Henrys Fork is a tributary river of the Snake River, approximately 127 miles (204 km) long, in southeastern Idaho in the United States. It is also referred to as the North Fork of the Snake River. Its drainage basin is 3,212 square miles (8,320 km2), including its main tributary, the Teton River. Its mean annual discharge, as measured at river mile 9.2 (Henrys Fork near Rexburg) by the United States Geological Survey (USGS), is 2,096 cubic feet per second (59.4 m3/s), with a maximum daily recorded flow of 79,000 cubic feet per second (2,240 m3/s), and a minimum of 183 cubic feet per second (5.18 m3/s). It is normally transcribed without an apostrophe. The river is named for Andrew Henry, who first entered the Snake River plateau in 1810. Employed by the Missouri Fur Company, he built Fort Henry on the upper Snake River, near modern St. Anthony, but abandoned this first American fur post west of the continental divide the following spring.

The North and South Menan Buttes in southeastern Idaho are two of the world's largest volcanic tuff cones. The two cones, with four smaller associated cones, align along a north-northwest line and comprise the Menan Complex. The buttes rise about 800 feet (250 m) above the surrounding Snake River plain and are late Pleistocene in age, dating to approximately 10,000 YBP (Years Before Present). The South Menan Butte is currently in private hands, however North Menan Butte is publicly owned and has been designated as a National Natural Landmark and a Research Natural Area by the United States Congress. The US Bureau of Land Management designated the North Butte as an Area of Critical Environmental Concern (ACEC). The volcanoes forming the two major Menan Buttes were created when basaltic magma came into contact with a shallow aquifer or with the precursor of the modern Snake River. Particles of volcanic glass called tachylite were created as the water turned to steam and explosively fragmented the hot magma. The cone shaped deposits are fairly uniform and consist primarily of tuff in lapilli-size particles. Some deposit layers preserve indentations, designated as "bomb sags", made as larger pyroclastic particles landed on soft layers of tuff. The Menan Buttes stand at an elevation of 5,619 feet (1,713 m.) and are very similar in size and shape. North Menan Butte is slightly larger and elliptical, with axes 3.5 and 2.5 km in length. South Menan Butte measures 3 km x 2 km. The crater of the North Menan Butte is about 3,000 feet (900 m) in diameter and the cone is about 6,000 feet (1,800 m) in diameter. The North Butte's volume is 0.16 cubic miles (0.70 cubic km) and the South Butte measures at 0.07 cubic miles (0.30 cubic km). In comparison, the better known tuff cone Diamond Head on Oahu has a volume of 0.15 cubic miles (0.6 cubic km). The larger buttes in the Menan Complex are asymmetrical. Each has a greater accumulation of material on the northeast, presumably due to strong southwest winds during the initial eruption. The Menan Buttes are located in Madison County, with lower slopes extending westward into Jefferson County. Nearby communities include Menan, Rigby, Rexburg and Idaho Falls, Idaho.

Annis is an unincorporated community in Jefferson County, Idaho, United States. Annis is 4 miles (6.4 km) north-northeast of Rigby. The first settlement at Annis was made in 1879. The community is named for Ann Kearney, first post mistress, plus the first letters of the word "island".The name history of Ann Island becoming Annis is disputed. A plaque located at the old "Annis Little Butte Cemetery," currently known as "Little Butte Cemetery," reads in part: "Annie's Place" Annis March 1879, the first of many hardy, courageous pioneers" ... "First public building was a combined log post office and home of James and Anna Kearney. They forded "Dry Bed Channel" of Snake River to bring mail to their central place which became known as "Annie's Place." Kearneys applied for postal service in 1886 which was granted in 1896 but with the name of Annis." Plaque No. 419 erected by the Daughters of the Utah Pioneers in 1982. The Josiah Scott House, which is listed on the National Register of Historic Places, is located near Annis.

The Josiah Scott House in Annis, Idaho was listed on the National Register of Historic Places in 1982.It is a one-and-one-half-story Colonial Revival stone house. It was during 1908-1910 by stonemason Alexander Whitehead using gray tuff stone from Menan Butte, with lighter tone stone used in quoins, sills, lintels, and the foundation. It has two brick chimneys.It was home of Josiah Scott, a homesteader whose patent on the land was completed in 1893.

Menan is a city in Jefferson County, Idaho, United States. It is part of the Idaho Falls, Idaho Metropolitan Statistical Area. The population was 741 at the 2010 census.

Cartier Slough Wildlife Management Area at 961 acres (3.89 km2) is an Idaho wildlife management area in Madison County west of Rexburg. The Army Corps of Engineers and Bureau of Reclamation acquired land for the WMA in 1976 and 1977 as mitigation for the Teton and Ririe dams.The WMA is located along the Henry Fork of the Snake River and provides habitat for waterfowl and over 200 wildlife species. Large game that can be seen in the WMA include moose, elk, and mule and white-tailed deer.

Lewisville is a city in Jefferson County, Idaho, United States. The population was 458 at the 2010 census. Lewisville is part of the Idaho Falls Metropolitan Statistical Area.

Yellowstone Bear World is a privately owned drive-thru wildlife park. It is located in Rexburg, Idaho, 80 miles from Yellowstone National Park. It was established in 1998.The park holds over 8 species of wildlife indigenous to the Greater Yellowstone Ecosystem. Other attractions in the park include a small amusement park and a petting zoo. Yellowstone Bear World is the only wildlife park in the United States where guests can bottle feed bear cubs.

Rigby High School is a four-year public high school in the western United States, located in Rigby, Idaho. Part of the Jefferson County School District 251, the approximate enrollment is 2,000 students in grades 9 to 12, from Rigby and surrounding communities. The school colors of RHS are maroon, white, and gold, and the mascot is a Trojan.

Rigby is a city in and the county seat of Jefferson County, Idaho, United States. The population was 5,038 at the 2020 census, up from 3,945 in 2010.

The Jefferson County Courthouse is a building located in Rigby, Idaho listed on the National Register of Historic Places. It was one of three nearly identical courthouses designed by Sundberg & Sundberg for 1938 Works Progress Administration projects.The Jerome County Courthouse, the Oneida County Courthouse, and this one all are two-story buildings with five-bay fronts and have elaborate terra cotta entries.The building was demolished March 15, 2016.

Burton is an unincorporated community in Madison County, in the U.S. state of Idaho.