From Wikipedia - The Sea of Nectar (Mare Nectaris) is a small lunar mare or sea (a volcanic lava plain noticeably darker than the rest of the Moon’s surface) located near the Sea of Tranquility (Mare Tranquillatis) and the Sea of Fecundity (Mare Fecunditatis). Several large craters are situated at the borders of Mare Nectaris. The largest one is lava-filled Fracastorius (124 km), which fuses with southern coast of the Sea. A prominent trio of 100-km craters Theophilus, Cyrillus and Catharina is located near northwestern coast.
Tech Specs: Sky-Watcher Esprit 120mm ED Triplet APO Refractor, Celestron CGEM-DX mount, ZWO ASI290MC camera, Televue Powermate 2.5x, best 50% of 5k frames under bad seeing. Captured with SharpCap v3 and processed using AutoStakkert! And Registax. Image Date: February 20, 2018. Location: The Dark Side Observatory in Weatherly, PA.