When established: 1968

Visitors last year: Ross Lake National Recreation Area, which takes in the Highway 20 corridor, counted 725,917 recreation visitors in 2013. Lake Chelan National Recreation Area: 37,315 visitors. The national park itself — mostly wilderness — counted 21,623 visitors. Complex total: 784,855 in 2013.

How big: 684,000 acres in the total complex

How high, how low: High point is 9,220-foot Goode Mountain in the national park’s southern district. Low point: 400 feet along the Skagit River at the park’s western boundary.

How deep: 1,486-foot-deep Lake Chelan is the nation’s third deepest lake (after Crater Lake and Lake Tahoe).

Trails: 400 miles

Wild things found here: 75 mammal species; around 21 species of reptiles and amphibians; roughly 200 species of birds; and at least 28 species of fish. Most often seen: Columbia black-tailed deer, Douglas squirrels and pikas. Rarer but out there: cougars, gray wolves and wolverines.

Number of glaciers: More than 300, more than any other park in the Lower 48 states.

Sources:National Park Service, National Parks Conservation Association