Short sword? long knife? African possibly Taureq?

[katana]

Cannot identify this Knife/sword? The three parallel grooves either side of the blade suggest Taureq / Taureq region (Sudan ?) as it's origin. Its not a reworked european blade,although its shape suggests it is. Its well balanced and feels more like a machete type knife? or a slaughter knife. The handle appears to be wood covered in leather. The scabbard is a good fit, nicely made, leather with tooling marks creating a repeated diamond pattern on the central panel.
The blade edge is still relatively sharp, even though it has not be sharpened for some time (the rust/patina is the same all over)
The blade is 39cm (approx. 15 1/2" long) overall length 50cm (20"").

Has anyone got any ideas please, thankyou