Wah-lah-tah
Here's a breakdown:
* Wah: Like the English word "wah"
* Lah: Like the English word "lah"
* Tah: Like the English word "tah"
The "Ou" at the beginning is pronounced like the "oo" in "moon" or "food". The "a" in "Oualata" is pronounced like the "a" in "father".
Remember, it's important to pay attention to the accent marks. In this case, the acute accent over the "a" in "Oualata" indicates that it should be pronounced with a long "a" sound.