Definition of ria noun from the Oxford Advanced Learner's Dictionary

 

ria

 noun
noun
BrE BrE//ˈriːə//
 
; NAmE NAmE//ˈriːə//
 
(specialist)
 
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a long narrow area of water formed when a river valley floods Word Origin late 19th cent.: from Spanish ría ‘estuary’.
See the Oxford Advanced American Dictionary entry: ria