Hi OP. I have a current DS applicant. As you know, Geog is a hugely broad and ranging subject that can be approached from a scientific perspective at one end, through the social sciences to the humanities at the other.
We found that BSc courses at many unis have slightly lowers entry requirements than BA courses - eg at Durham is A*AA for the BA, AAA for the BSc. It’s the same at Exeter. Bristol is a BSc and it’s AAA too. But if he’s eligible for a contextual offer (based on various factors) these three unis will make lower offers such as ABB.
Oxford and Cambridge both offer only a BA (though there is a balance of physical and human topics in both courses), but the minimum grades for both is A*AA and he would be very unlikely to get to the interview stage with anything lower.
If he’s very much into the physical side, he could also look at degrees in geology or environmental science?
All the Geog courses I’ve mentioned above (but not Oxbridge) offer a year abroad option, either at an overseas uni or in a work placement.
If coastlines are his thing, Exeter could be a good one. They have two campuses - one in Exeter (he would need a minimum of AAA for the BSc there, I think), but they also have another campus in Cornwall (Penryn) where they ask lower grades for the same course. Penryn is less popular due to a more remote location (hence the lower grade requirements), but it might be right up his street as it’s coasts galore down there.
So if he has AAA predictions, he could apply for BSc Geog at Exeter, Durham and Bristol maybe? Then he would need insurance options, so have a look at maybe Sussex or Southampton? Both these have great programmes and Year out options. There will be others too, but these are the ones that spring to mind. York might be another.
Of course, there will be Geog courses at unis such as Manchester, Birmingham, UCL etc, but as a physical geographer, a city location may be less appealing? I don’t know...
My DS is very much on the human side of Geog, so has applied to LSE where the focus is political / economic geography and a lot of overlap with the social sciences in general, but this course probably wouldn’t interest your DS.
As I say though, have a look at geology and environmental science courses too.
Hope this is helpful and good luck to him!