Mare Smythii
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| Mare Smythii | |
 Mare Smythii |
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| Coordinates | 1.3° N, 87.5° E |
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| Diameter | 373 km |
| Eponym | Sea of William Henry Smyth |
Mare Smythii (Latin for "Sea of Smyth") is a lunar mare located along the equator on the easternmost edge of the lunar near side. The Smythii basin where the mare is located is of the Pre-Nectarian epoch, while the surrounding features are of the Nectarian system. The mare material, which make up the floor of the mare, is a high aluminous basalt, and consists of Upper Imbrian basalt covered by Eratosthenian basalt.
The crater Neper is located to the north of the mare. This crater makes up part of the southern rim of Mare Marginis. Just off to the northwest of the mare are the craters Schubert and 'Schubert B'. The dark mare-filled crater at the southern edge of Smythii is the crater Kästner.
The Mare Smythii is named for the 19th century British astronomer William Henry Smyth.
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