Ha'olam

Ha'olam was a human colony world in the 22nd century. While originally established by humans, they shared the world with Lacaillans and Caxtarid. The planet was located near Mu Camelopides VI and Occam's World. (PROSE: Dreamstone Moon)

History
The colonists of Ha'olam used Ornithopters as a public transport service.

Samantha Jones spent three years on Ha'olam while separated from the Eighth Doctor. The Doctor also spent three years on Ha'olam at the same time. He spent the majority of the time in a prison: the Oliver Bainbridge Functional Stabilisation Centre. This was the nicer of two prisons. The other one on the planet was the Brian Lindsey Memorial High Security Correctional Facility. (PROSE: Seeing I)

Behind the Scenes
In Hebrew, ha'olam (העולם) means "the world." Judging by this and by the abundance of Jewish characters in Seeing I, it is safe to assume that the planet has Jewish/Hebrew origins.