丘陵
qiū líng · HSK 7
hills
⛰️ 丘 (mound) + 陵 (mound/ridge) = rolling hills, two gentle rises stacked
丘 means a small hill or mound; 陵 means a large mound or ridge (also an imperial tomb-mound). Together 丘陵 names the bumpy mid-height terrain between flat plains and real mountains: hills.