Main Page | See live article | Alphabetical index Mare Undarum (the "sea of waves") is a lunar mare located just north of Mare Spumans on the lunar near side. It is one of the many elevated lakes contained in the Crisium basin, surrounding Mare Crisium. The surrounding basin material is of the Nectarian epoch, with the mare basalt being of the Upper Imbrian epoch. The crater Dubyago can be seen on the southern edge of the mare. On the northeastern edge of the mare is the crater Condorcet P. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.