A narrow,steep-sided,elongated estuary formed from a glacial trough inundated by seawater is referred to as a/an:

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A fiord is a narrow, steep-sided, elongated estuary formed from a glacial trough inundated by seawater. Eskers are long, winding ridges of gravel and sand deposited by a meltwater stream flowing beneath a glacier. Horns are sharply pointed mountains formed by the headward erosion of several cirques. Arêtes are narrow ridges that separate two adjacent glacial valleys, while tarns are small, mountain lakes formed in natural hollows left by glacial erosion.

A Narrow,steep-Sided,elongated Estuary Formed from a Glacial Trough Inundated by Seawater