The kingdom of Mandah is located on Sumatera, in the region of Indragiri, but was part of the sultanate of Riu Lingga (kesultanan Riau Lingga).
About the kingdom of Mandah
There is no information about this kingdom, there is only the foto below.
Mandah was situated in the Indragiri lowerlands district, but not belonging to the Indragiri kerajaan. It was part of the Riau-Lingga sultanate area. The kingdom had in 1930 ca. 10.000 people.
– Source: donald tick, Facebook.
Source (only indon. language)
– Tentang Mandah, Indragiri: https://id.wikipedia.org/wiki/Mandah,_Indragiri_Hilir
– Kerajaan Batin Enam Suku (dan Mandah): http://moslemwiki.com/Kerajaan_Batin_Enam_Suku