The geography of the sandbar is a little round islet in the middle of where Nabi Lake and Hylia River meet, with Horwell Bridge at the southwestern part and Eagus Bridge at the southeastern part. On this islet, there are flowers there that have been planted by their caretaker, Magda, the only inhabitant of the sandbar. In the center of the flower garden, Link will notice the Hila Rao Shrine smack in the center of the sandbar.
However to be able to get the center of the sandbar, Link must complete a Shrine quest called "Watch Out for the Flowers", given by Magda if he should step on the flowers for the first time. If Link steps on the three times, even after the Shrine quest had been completed, he will suffer three Heart Containers worth of damage from a pummeling via Magda. It is in that shrine that Link will meet the Sheikah Monk Hila Rao after completing the trial inside known as "Drifting".