丘陵|きゅうりょうkyuuryou[0]heiban (flat)

1. nounhill; hillock
   飛行機ひこうきから見みると、小ちいさな丘陵きゅうりょうは平地へいちのように見みえる。↗

   Small hills look flat from an airplane.
2. nounrolling hills; foothills

• SynonymおかNeutralA single small hill, common in everyday speech; 「丘陵」 is the more geographic term for rolling hill country.
• Related陵丘りょうきゅうWrittenWritten style and rarely used; can mean a single raised hill, while 「丘陵」 stresses terrain of rolling hills and low rises.
• Antonym平地へいちNeutralFlat, level ground — the opposite of the rolling terrain of 「丘陵」.

Use 「丘陵」 for rolling hill country, as in 「丘陵地」; for a single small hill say 「丘」; for flat land say 「平地」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. なだらかな起伏きふくや、小山こやま・丘おかの続つづく地形ちけい。