上越
じょうえつ area on Japan Sea side of Japan, including Niigata
Why it means this
上 (from 上野, the old name for Gunma) + 越 (from 越後, the old name for Niigata) — the region and rail line linking Gunma and Niigata across the mountains (上越新幹線).
Breakdown
Each character links to its full entry — origin story, stroke order, and readings.