This rigorous but rewarding 9.8-mile out-and-back on the Pacific Crest Trail climbs more than 2,000 feet to a summit with splendid high-desert views.

SOUTHERN TERMINUS to BOULDER OAKS CAMPGROUND: From the US-Mexico border, begin this 21.2-mile leg with a traverse of Hauser Mountain's broad slopes before descending into the lowlands near Lake Morena.

CA 138 to I-15: On this 10.5-mile stretch, climb through sandy washes and gullies around Cleghorn Ridge to overlooks of Cajon Canyon and the San Gabriel Mountains.

CA 2 to THREE POINTS: This 25-mile leg has a mad list of peaks. Start by climbing 2,000 feet up Mt. Baden-Powell with views unfolding to the Sierra Nevada. Then zigzag the swelling ridges of the San Gabriel Crest.

HIKERTOWN to TEHACHAPI/WILLOW SPRINGS ROAD: This one isn't for tender-footed hikers. Best saved for springtime, it's a hot run for 37 miles across the Mojave Desert peppered with iconic Joshua trees.

TEHACHAPI/WILLOW SPRINGS ROAD to LANDERS MEADOW: Climb through the Piute Mountains on this 42.5-mile stretch past dry mining claims and an expanse of sagebrush and yucca.

WALKER PASS to KENNEDY MEADOWS: Go 48.5 miles on the Kern Plateau, a slanted wilderness that connects foxtail pine country to the crumbling granite obelisks of the Sierra foothills.

LAGUNA MEADOW to CA 78: Starting on the Laguna Rim, this 25.7-mile leg passes over granite knobs with long views into the undulating desert.

I-10 to BIG BEAR CITY: This 48.9-mile segment offers plenty of crowdfree miles through twisty canyons, past wind farms and into fragrant fir groves.

BIG BEAR CITY to CRAB FLATS ROAD: Follow the forested high ridges across the San Bernardino Mountains to creekbeds tangled in sagebrush on this 21.6-mile leg.