I legit want to suggest lavastorm. Folks here seem to hate it, but I discovered that zone on my own at level 12 in 99 and I really enjoyed the type of vibe I felt there, fighting in a volcanic rocky zone. There are some interesting named creatures that spawn occasionally too.. if you're exping out there, do it in the area in front of the collapsing doors.
And going in and out of najina for those levels I recommend too, it's a great zone. Good treasure for the level too.
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