Princess Ragnhild Coast is the portion of the coast of Queen Maud Land in Antarctica lying between 20° E and the Riiser-Larsen Peninsula, at 34° E. All but the eastern end of the coast is fringed by ice shelves. It was discovered by Capt. Hjalmar Riiser-Larsen and Capt. Nils Larsen in aerial flights from the ship Norvegia on February 16, 1931, and named for Princess Ragnhild of Norway.
Queen Maud Land in Antarctica, discovered by Capt. Hjalmar Riiser-Larsen and Capt. Nils Larsen in aerial flights in 1931, is the larger body encompassing Princess Ragnhild Coast. 
Contextually, we don't know if Queen Maud Land was also discovered in 1931, nor by the same captains, or if it was just this particular coast, which is a part of the whole.  AI confused by the questionable rewording which was surrounded by fact-rich information. 