1971 Apollo 15 Astronauts visited the east of Yapingning (near Rima Hadley and Hadley Derta ）A geological survey was carried out. The Apennine Mountains form a large Moon Sea Rainy Sea The southeast edge and Snow land The northwest edge of the highland is steeper on the side facing the Rainwater Sea, while the back side is relatively gentle and transits to the lowland. It starts with striking Erradoche Crater Due west (it is close to the south side of the Apenning Mountains); In the western mountains, there is a line between the northern part of the Rainy Sea and the Island sea Narrow canyons linked together in the south; Farther to the west is Karbaqian Mountains 。 Northern Apennines and Hemas Mountains It borders on the west edge, and is connected with the Archimedes Facing each other; The southern end of the mountain will Rainy Sea And Shuwan separate; To the northwest of the Apennine Mountains is Rainy Sea and Sapropel On the southeast side Steam sea Of Loyalty Bay and Happy Lake , Resentment Lake. From the 59km diameter Erradoche Crater Starting from, the mountain ranges gradually bend from southwest to northeast to form an arc mountain chain, and finally end at "Promontorium Fresnel" at 29.5 ° north latitude. Here, another wide rift of the mountain ranges runs through from east to west Rainy Sea and Chenghai The north end of the canyon is Caucasus Mountains 。 The Apennine Mountains include several named mountains, from west to northeast:
Wolff Hill
Mons Huygens , often listed as The highest mountain on the moon (Although not the highest point) Bradley Hill
Hadley Derta
Hadley Hill
The valley formed by the last two peaks is probably the most famous valley because Apollo 15 The task is logged in here. This landing is believed to be Apollo program One of the most successful missions in, it launched the following three "J series" missions, including a lunar rover and a three-day stay. Apollo 15 detected smaller“ Hadley Derta ”And“ Hadley Creek ” Moon Valley This may be the landing point with the most diverse geological conditions in the plan. Most of the mountains constitute Rainy Sea A jagged and irregular edge, of which there are broad foothills on the southeast side, but the northwest side Archimedes Crater A part of the foothills in the southeast is rugged. The Apennines have a total length of about 600 kilometers (370 miles), the highest peak Bradley Hill It is 5.4 kilometers higher than the surface of the adjacent Yuhai Sea, which is equivalent to 3.42 kilometers higher than the average elevation of the moon surface. 
