"The Maasai Mara is a big park"

Translation: Maasai Mara ni mbuga kubwa

[BwanaSimba]

Mbuga is not a word from the M-/Mi group, but from the N- group. In this group the adjective doesn't take a prefix. It only takes a prefix when the radical starts with a vowel (NY-), a D, G, or Z (N-), or a B, P, or V (M-).

[DirtySvensk]

Why would it be 'Kubwa' instead of 'Mkubwa?'