natural depression

Từ điển Oxford Learners Wordfinder Dictionary

noun

a sunken or depressed geological formation
• Syn:
depression
• Ant:
natural elevation
• Hypernyms:
geological formation, formation
• Hyponyms:
basin, bed, bottom, crater, hole,
hollow, lowland, sinkhole, sink, swallow hole, trench,
deep, oceanic abyss, trough, valley, vale