Not sure if this has been discussed. But I found an unmarked burial ground on an island Northeast of the Glacial Cave. Currently staring at an Ancient Dragon. There is no word wall.

There is also a locked novice chest.

I dont think burial grounds are normally marked. The one by anga' mill isnt, and that dragons even named.

they are not marked in game... but they are marked on the physical map as Xs i believe you got with the game.

I guess one could call it a Dragon Lair.