Shasta County is in the Shasta Cascades region of California. The county is a land of mountains, lakes and rivers, in particular massive Shasta Lake, California's largest reservoir and the "houseboat capital of the world". Several spectacular waterfalls can be found in the county, including the 129 ft (39 m) Burney Falls, which Theodore Roosevelt described as "the Eighth Wonder of the World", and McCloud River Falls, which is actually three scenic waterfalls.
- Redding Municipal Airport (RDD IATA): has flights from Los Angeles International Airport and San Francisco International Airport with United Express.
- 1 Siskiyou County - Shasta County's northern neighbor is dominated by 14,179 ft (4,322 m) Mount Shasta, the west coast's second-tallest volcano, towering nearly 10,000 feet (3,000 m) above its surroundings; while a summit climb requires advanced mountaineering skills, its lower slopes are great for hiking, backpacking and cross-county skiing. The Volcanic Legacy Scenic Byway links Mount Shasta to Lava Beds National Monument in the county's northeast, home to over 800 lava tube caves, several of which are open to exploration. The county is also a premier destination for birdwatchers, with nearly two million birds passing through Lower Klamath National Wildlife Refuge and Tule Lake National Wildlife Refuge during migrations, and North America’s largest concentration of snow geese arriving in spring.
- 2 Modoc County - Shasta County's northeastern neighbor is in California's northeast corner and is home to only about 10,000 people, or slightly more than two people per square mile. Modoc County's northern and western portions have been shaped by volcanism, as evidenced by the many lava flows, cinder cones, hot springs, and volcanic mountains that visitors will encounter, while the Warner Mountain range and its many alpine lakes are found in the county's eastern side. The county is home to several wildlife refuges where bald eagles, peregrine falcons, goshawks, golden eagles, mule deer, elk, wild horses, wild burros and pronghorn antelope can be seen.
- 3 Lassen County - Located east of Shasta County, rural Lassen County sits at the confluence of the majestic Sierra Nevada mountains, the volcanic Cascade Range, and the high elevation Great Basin desert. Fishing, biking, hiking, and other outdoor activities attract most visitors to the area, with the 26 mi (42 km) Bizz Johnson trail the county's most popular hiking and biking route. "The Bizz" follows the old Fernley and Lassen Branch Line of the Southern Pacific railroad along the Susan river canyon, traversing abandoned railroad bridges, trestles and tunnels and rewarding visitors with mountain views, beautiful fall foliage, and colorful spring wildflowers.
- 4 Plumas County - Located southeast of Shasta County, the forests, rivers and mountains of Plumas County were originally inhabited by Native Americans before miners arrived during the Gold Rush, followed soon after by loggers, and today tourists visit the county for its camping, fishing, whitewater, snowshoeing, and other outdoor opportunities. The Feather River Scenic Byway is a popular way to see the county's beauty, with the east-west route following California's first designated wild and scenic river past nearly one hundred waterfalls, historic bridges and tunnels, spring wildflowers, vivid fall colors, and the "Stairway of Power" consisting of seven hydroelectric powerhouses installed along the river.
- 5 Tehama County - Shasta County's southern neighbor, Tehama County has a quintessentially "western" feel, with most county residents employed in ranching, timber or farming, and most tourists drawn to the region for fishing, boating, hiking, and other outdoor activities. The county's largest town, Red Bluff, has a population of only about 15,000 inhabitants, but hosts the Red Bluff Round-Up, one of the west's largest annual rodeos, each spring. While there are numerous streams and rivers, the Sacramento River is the largest, intersecting the county and offering excellent fishing for rainbow trout, king salmon, chinook salmon, steelhead, smallmouth bass, sturgeon, and striped bass.
- 6 Trinity County - One of only three California counties with no incorporated cities, rugged Trinity County lies among the Salmon and Klamath Mountains along the Trinity River. The county seat of Weaverville is home to some of California's oldest buildings, with the state's second oldest courthouse (built in 1856), a drugstore that has filled prescriptions since 1852, and California's oldest Taoist Temple (operating since 1873). Those looking for outdoor adventure will find numerous opportunities for camping, backpacking, rock climbing, boating, rafting/kayaking, hunting, and fishing, with Trinity Lake in particular a favorite spot for houseboat rentals.