Ymroddiad
or a series of drawings inspired by this scene:
“The hills were odd; irregular and richly covered with grass, they drew the eye queerly as they went overhead. ‘Oh,’ said Emily suddenly, on the forward lookout, craning her head over Temeraire’s shoulder to look down at them [...]. Temeraire’s wing-beats slowed. ‘Oh,’ he said. The valley was full of them: not hills but barrow-mounds, raised over the dragons where they had breathed their last. Here and there an outthrust horn or spike came jutting from the sod. In places a little fall of earth had bared the white curve of a jawbone. [...] They flew on silently, above the verdant deserted green, Temeraire’s shadow flowing and rippling over the spines and hollows of the dead.”
Empire of Ivory, chapter 14
and by @elexuscal's vision of a hypothetical painting of the burial grounds. I've added image descriptions with some further details and context.