Gisa Crater is a location in Breath of the Wild.
Right in the center of the crater, Link will encounter a Stone Talus.
To the northwest of the crater, there are circles of rocks and if Link puts the missing rock right in the center, he will get a Korok Seed. A second Korok can be found just south of the crater in an area with a few trees. Use Magnesis to place the iron ball in the tree stump.
Link fighting a Stone Talus.
Nearby Korok Seeds
Complete the bullseye pattern by putting a rock in the center.
Put the iron ball in the stump.