Close to Arches, the river and wide open...
These sites are first come first serve and are pretty flat and have your normal table and fire ring.
However, you also have open top (no roof) pit toilets and no potable water...so make sure you have some with you as I'm not sure about drinking from the river...
The sites themselves are nice and not too packed together. But you really only have some brush for shade. Although you have great views and will probably want to get out exploring anyways.