But!...Where did they go?

Straight to hell... along with scar!

Seriously... I belive they still live within the outlands but in a different part.
You know the outlands seems to be pretty big.
(Based on the perspective of TLK-scene when Mufasa & Simba sits on top of Priderock.)

Hm...I know that there are the Pride Lands, the Outlands, a desert and the jungle.
Outlands, I guess, are the regions around Pride Lands.
There is the termite hill, the...erm...strange cave with the hot-air-spots, or how these things are called, and the elefant graveyard,...

I believe in that hyenas are gone wider away, because...the Outlanders know the whole outland, even the place hyenas have been a time ago. The cave...
If they were still here, the Outlanders would have to know it...
And Nuka said: "If the hyenas were still here,..."

I think that they have gone, gone through the desert, gone through the jungle...

Gone to Mars :P

Shaaadowfox!
They haven't been able to go to Mars because they would have needed a ladder!
Have you ever seen a ladder in TLK? No?

Shadowfox: You know the kid has a point. =)

Jeah, winner!

He has made a stupid joke, so I have made a stupid answer joke

Yeah... "- Stupid questions deserve stupid answers!" - One clever person

Excactly

Oh.. they went to Mars because they prooved a theory which they got a lot-o-money for.

Geometry is how fourth-dimensional time incorporates as third-dimensional form. The incorporation of time as geometrical form informs all of the inorganic and organic orders of the realm of instinct. Time incorporated as the geometry of form is the principle example of T(E)=Art. All forms and species participate in varying orders of geometry of form, both in their bodily structure and their forms of process.

Stop writing your stupid nonsense right now, Shadowfox!
I could have ideas of biting you otherwise

E=MC²

Okay okay - just telling you why they'd gone to Mars! You wanted to know!

a²+b²=c²

You wanna Maths test? You can have

And, yeah, if they ever should go to Mars its because the things you said.

That's for sure!