Ukuku Plains is a location in Breath of the Wild.
The Ukuku Plains are located at the southeast portion of the Akkala region, just east of South Lake Akkala. It is a grassy, open area with some Water Buffalo and the occasional Grassland Fox wandering around. The south end of the plains contains a small forest area, with a variety of plant life. There are also some Woodland Boars, Red-Tusked Boars, and Mountain Doe roaming around.
On a small hill at the south end of the plains, there is a pinwheel. When Link walks nearby three balloons will appear over the forest. Link can shoot them down to get a Korok Seed. Further up the hill, there is a stack of rocks that can be blown up, revealing a treasure chest with an Opal. There are also some Ore Deposits and a Rare Ore Deposit on top of these rocks, as well as in the underpass.
Nearby Korok Seeds
Stand by the pinwheel, shoot the three balloons. One of the balloons is very low hiding behind trees, it might help to chop down the trees first to get a clear shot.