Why is the early settlement of Madagascar still debated by scholars?

The early settlement of Madagascar remains a subject of scholarly debate primarily because there is no direct empirical evidence detailing how, why, or by what route the first settlers arrived on the island approximately 1,300 years ago.1

While the Malagasy language and culture point to Indonesian origins, the population exhibits a unique blend of Asian and African features. Scholars hold conflicting theories regarding this mixture:21

• Direct Migration: Some argue that the first settlers arrived directly from Indonesia in a single voyage, with African influences introduced later through migration and the slave trade.1
• Gradual Migration: Others suggest the island was settled through multiple voyages along the coasts of India, the Arabian Peninsula, and Africa, meaning the founding population was already ethnically and culturally mixed.1

The precise history and nature of the relationship between these Asian and African influences remain unresolved, as does the exact timeline and mechanism of the initial human arrival.213