The following image shows the 5 largest satellites of Uranus: Miranda, Ariel, Umbriel, Titania, and Oberon. There are 10 additional small satellites.

The satellites of Uranus

The most interesting moon geologically is Miranda, shown on the left. Even though it is only 500 km in diameter, it shows surface geological features that are as varied as any site in the Solar System.

It is not clear why Miranda has been so active geologically. Some theories invoke tidal heating effects earlier in its history, or a collision that tore it apart and allowed it to coelesce again. None are very conclusive.

Information supplied by: http://csep10.phys.utk.edu