Colonial Space: planetary geography

A. Planetary Geography
1d20   Geography
01-10  forest/jungle
11-15  swamp/marsh
16-17  ocean/sea
18        desert
19        mountains
20        ice

Result: the colony world was shattered as a near ftl warpfield punched a hole through crust and mantle in a glancing blow that drained its seas into two holes connected by a deep fissure. The planetary magnetic field pours out of the near bottomless oceans while the atmosphere is blown slowly away. It will be gone in a million years though this is sufficient time for the needs of the colonizers.

The terraforming reforested it in trees and the species the colonials are familiar with, but the alien life that called this world home and are thought now to be extinct survived in its subterranean realms. A desert near the southern pole exists where lunar fragments impacted, the fireball radiation sterilizing the surface.
The oceans drained leaving behind tidal mudflats. Mountains are pushed-up fragments of the iron core.