This sort of feature provides the name of a woman who enchanted Merlin and raised Lancelot near one of these places.
To imprison Llao, the Klamath god of hell, the sky god Skell creates one of these natural features from the lava of Mount Mazama. It's not a cave, but Percival uses an adder stone to kill the invisible Afanc monster, which terrorizes one of these natural features. The Ojibwe believe that the copper near one of these features is guarded by Mishipeshu, a scaly horned panther. After her birth from Pallas, Athena was raised near one of these natural features named for Triton. After she causes the execution of his mother, Sir (*) Balin the Savage beheads a spirit from one of these features. This sort of feature provides the name of a woman who enchanted Merlin and raised Lancelot near one of these places. For 10 points, the woman who gives Excalibur to King Arthur is known as the "Lady" of what sort of body of water?
To imprison Llao, the Klamath god of hell, the sky god Skell creates one of these natural features from the lava of Mount Mazama.
lakes [or lacs; accept springs; prompt on bodies of water until read]