I like giants in warsliks, since there's almost always a group there and it'll get you quite a few levels. If you're intent only on soloing, you can do crocs and orcs in oasis at that level (it's not that far from cab, only takes like an hour to get there). You might also be able to solo low level giants at 20 in warsliks. Lake of ill omen, as always, has stuff you can solo somewhere around.
Kurns tower is also a good choice, but once again you probably want a group.
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