Best place for geographyWatch
The highest ranked departments include the obvious (Durham, UCL, Bristol, Oxbridge, Edinburgh) but also the top redbricks and other Russel Group unis such as Sheffield, Newcastle, Cardiff.
But it depends what your interest is. Human, physical? Do you want to be in a collegiate uni?
If physical: are you interested in all aspects, or do you have a particular interest in cryospheric science (glaciers/periglaciology), hydrology & coasts, biogeography, climatology, general geomorphology, etc?
If human: are you interested in all aspects or do you prefer: economic; contemporary (environmental issues etc), historical, philosophical/theoretical?
Do fieldwork locations matter a lot to you?
Is there any chance you'd be interested in doing a four year undergraduate MSci?
Sorry for all the questions it's just that geography is such a diverse topic that you really need to make sure that you know what you want so you can choose the ideal course for you. Although the diversity of geography means you could blindly walk into any uni and still be able to choose some good modules, some universities go more in depth in some topics than others and some don't even cover them at all.
Just make sure you check out all of the courses thoroughly.