Toroidal Planets are hypothetical rocky planets that are shaped like a toroid, or doughnut. They have never been observed to actually exist but they may be at least quasi-stable structures in the real world. Of course, in fictional worlds or within your own worldbuilding they may be a much more common occurrence.

It is predicted that the tidal force of toroidal planets would force its’ tectonic plates inwards towards the central hole, generating potentially immense mountain ranges along the inner rim of the planet where the plates collide.