Small inlet

RIA

Think of a coastal feature formed by a submerged river valley, often found in places like Galicia or Ireland.

"Small inlet" refers to a narrow, coastal waterway formed by the flooding of a river valley, and the answer is RIA. It’s a straightforward definition—no wordplay here—just a geographical term for a specific type of inlet, like those found in places such as Galicia, Spain or Ireland. The clue relies on knowing that ria is the technical name for this kind of feature, not just a generic word for any small bay.