Lunar Maria Named in the 19th and 20th Centuries

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Mare Humboldtianum
Humboldt's Sea
231 kilometers wide
35,475 square kilometers
Named by Madler, 1837

Mare Anguis
The Sea of Snakes
146 kilometers wide
8150 square kilometers
Named by Franz, 1913

Mare Marginis
The Border Sea
358 kilometers wide
64,900 square kilometers
Named by Franz, 1913

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Mare Undarum and Spumans
The Sea of Waves and the Foaming Sea
245 and 143 kilometers wide
55,000 square kilometers (combined)
Named by Franz, 1913

Mare Smythii
Smyth's Sea
373 kilometers wide
104,000 square kilometers
Named by Birt asnd Lee, 1865

Mare Australe
The Southern Sea
997 kilometers wide
319,000 square kilometers
Named by Madler in 1837

Mare Insularum
The Sea of Islands
512 kilometers wide
110,200 square kilometers
Named by Dom Wilhelms, 1976

Mare Cognitum
The Known Sea
350 kilometers wide
120,000 square kilometers
Named by Kuiper, 1964

Mare Orientale
The Eastern Sea
294 kilometers wide
69,000 square kilometers
Named by Franz, 1913

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