亚平宁山脉是月球北部的山脉，以意大利的亚平宁山脉命名，其地层年代为39亿年，还相对年轻。亚平宁山脉是月球上最大的山脉。

1971年阿波罗15号宇航员对亚平宁东部(靠近哈德利月溪和哈德利·德尔塔山)进行了地质调查。

亚平宁山脉构成了大月海雨海的东南边缘和雪陆高地的西北边缘，面朝雨海一侧较陡，背面则相对平缓地过渡到低地。它起始于显目的厄拉多塞陨石坑(Eratosthenes)正西面(它紧靠着亚平宁山的南侧)；西部山脉中有一条将雨海北部与岛海南部连接在一起的狭窄峡谷；西面更远处是喀尔巴仟山脉。

亚平宁山脉北部与海玛斯山脉西侧边缘接壤，中间及西北方与阿基米德山脉"相望；山脉南端将雨海与暑湾隔开；亚平宁山脉西北侧是雨海和腐沼，东南侧则是汽海的忠诚湾及幸福湖、怨恨湖。从直径59公里的厄拉多塞陨石坑处起，山脉由西南往东北逐惭弯曲形成一条弧状山链，最后终止于北纬29.5°处的"菲涅耳岬"(Promontorium Fresnel)，在此，山脉的另一宽阔裂口东西贯通了雨海和澄海，峡谷的北端则是高加索山脉。

Montes Apenninus are a rugged mountain range on the northern part of the Moon's near side. They are named after the Apennine Mountains in Italy. With their formation dating back about 3.9 billion years, Montes Apenninus are still relatively young.

This range forms the southeastern border of the large Mare Imbrium lunar mare and the northwestern border of the Terra Nivium highland region. It begins just to the west of the prominent crater Eratosthenes, which abuts against the southern face of the range. To the west of these mountains is a narrow gap where Mare Imbrium in the north joins Mare Insularum to the south. Further to the west are the Montes Carpatus mountains.