mountainous desert landscape filled with saguaro and cholla cacti, palo verde trees and ocotillo in saguaro national park

saguaro national park tucson mountain district arizona usa botany nature cacti vegetation outdoors spring landscape desert tourism travel adventure vacation sight solitude peaceful hiking harsh environment ecosystem rugged bucket list west america top blue sky wispy clouds carnegiea gigantea ocotilla fouquieria splendens opuntia cholla pima county palo verde valley view overlook trail rocky flowers orange mountainous filled trees ocotillo scrub brush