Big Valley

For me Roanoke Ridge, The Heartlands, Big Valley, Grizzlies West and Bayou Nwa.

Between Tall Trees and Big Valley there I'd the famous Owanjila Dam from 1898-1907 in Red Dead Redemption 2 yet the dam doesn't appear or is mentioned at all during the events of Red Dead Redemption in 1911-1914. Do you all think a disaster happened to destroy the dam or maybe the snowy weather of Northern Tall Teees played a part in it's destruction

Does anyone know the name of the camp, where Ike Skelding's men were holding Sean MacGuire captive in the single-player mission "The First Shall Be Last"? It also appears in Red Dead Online in the Samson Finch mission ''These Bastards Can Fight". Or is it just an unnamed location? Below is a map of the area. The location is marked by a red arrow.

There's a tall stone in the centre of a ring of smaller stones just west of the main peak of Mount Shann. Some of the outer ring of stones have yellow arrows painted on them, pointing off in various directions along the northwestern edge. I figure someone has asked about this before, but didn't note it down in the article, so any ideas?