Geologic map of the Mare Undarum Quadrangle of the Moon

The map area contains two mare provinces, one terra province, and one province of mixed mare and terra. The maria are the semicircular southern half of Mare Crisium and the northeast sector of Mare Fecunditatis. The massive belt of terra that arcs across the quadrangle between these maria is the south rim of the Crisium multiringed basin; its southwest part is probably superposed on an older, originally similar, accurate rim of the Fecunditatis basin. The fourth province, in the southeast corner, includes small irregular maria such as Mare Undarum and Mare Spumans and intervening peninsulas and islands of terra.

本测绘区域包含两处月海（mare）地貌单元、一处月陆（terra）地貌单元，以及一处月海与月陆混合的地貌单元。两处月海分别为危海（Mare Crisium）的半圆形南半部，以及丰富海（Mare Fecunditatis）的东北部片区。横贯本测区、介于两处月海之间的弧形广阔月陆带，为危海多环盆地的南缘；其西南段大概率叠加于更古老、原始形态相近的丰富海盆地规整外缘之上。位于东南角的第四处地貌单元，包含浪海（Mare Undarum）、泡沫海（Mare Spumans）等小型不规则月海，以及其间分布的月陆半岛与岛屿。