This post is a list of the largest maria on the Moon by diameter. Wikipedia says, "The lunar maria are large, dark, basaltic plains on Earth's Moon, formed by lava flowing into ancient impact basics. They were dubbed maria (Latin for 'seas')..." (Wikipedia: Lunar mare, 6.5.24 UTC 12:26)
- Oceanus Procellarum: 2,568 km
- Mare Frigoris: 1,596 km
- Mare Imbrium: 1,123 km
- Mare Fecunditatis: 909 km
- Mare Tranquillitatis: 873 km
- Mare Nubium: 715km
- Mare Serenitatis: 707 km
- Mare Australe: 603 km
- Mare Insularum: 513 km
- Mare Marginis: 420 km
Sources
Wikipedia: List of maria on the Moon
Photo: Wikimedia Commons, What The Puck, CC BY-SA 4.0
