natural depression
na·tu·ral·depression
noun
1.
a sunken or depressed geological formation
Related words
Broader terms
WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
na·tu·ral·depression
a sunken or depressed geological formation
WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.