Yunzabit Heights is the place where Kami landed on Earth when he was first sent. His home planet Namek was in danger of being destroyed and his father sent him to Earth in a spaceship hoping to save him. Yunzabit Heights is said to be very barren and cold. Kami's spaceship was left there for many decades, until Bulma took it to her father, Dr. Briefs and he fixed it up for space travel. Bulma, Gohan, and Krillin then used it to get to Planet Namek. From Dragon Ball Wiki, a Wikia wiki.