History and specifics
One part of it looked like a nigh-inhospitable wasteland, barren with steaming crater holes. Sand worms lived in this region. The Shin-Ka-Ti plant was known to grow only in this region, and nectar from that flower provided the only known cure for the Red Plague.
In 2279, Captain Spock visited the Kendha-Ya region to retrieve a Shin-Ka-Ti plant. He estimated his probability of dying there at 0.57808. While removing one of the plants, he was attacked by a sand worm, which he was forced to kill using a hand phaser. (TOS comic: "Terminally Yours")