The first photo is looking SE from Spirit Mt.
which is north of Christmas Tree Pass. In the left distance Lake
Mohave and Davis Dam which regulate the flow of Hoover Dam and
Lake Mead 67 miles upstream to the left (North). To the right the
Colorado River continues South passing Bullhead City on the Arizona side
and Laughlin on the Nevada side.
Christmas Tree Pass is located
in the SW corner of the Lake Mead Recreation
Area, about 5 miles NW of Laughlin. The rock formations are larger
than in Joshua Tree so I am surprised the area
doesn't get more climbers. This is the one place one only wants to
visit during the coldest time of the year. NPS rules and rangers
abound in both areas so there isn't much difference there.
The photos below were taken in various locations