The tumuli (or ‘Awellos’ in the local language) are ancient funeral complexes which date back to approximately 3,000 BC. Important persons were buried in an imposing tumulus adorned with precious goods. The tumuli were made of volcanic rocks and are 30m in diameter. Large numbers of them remain.
Full screen map of Les Tumulus (Awellos) (On tentative list - Djibouti)
It's impossible to make a huge review about these Tumulus. There are a lot in Djibouti. I'm not sure if these should be inscribed. I think not. But there are many near Lake Abbeh as well, which, maybe, could be inscribed together with the lake as a cultural landscape. They are, as stated, a pile of black rocks mainly. They are not like other "beautiful" tumulus in other parts of the world. Nothing really special.