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Any broad, estuarine river mouth.
A long, narrow coastal inlet, except a fjord, whose depth and width gradually and uniformly diminish inland.


(1) (Rich Internet Application) An application that approaches the speed and elegance of a locally installed application. An RIA typically refers to an app that uses the Web browser to run embedded scripts within Web pages. However, it may also refer to a "rich client application" that interacts with the Internet in some manner but does not run from the browser (see rich client). See Silverlight, Flex and AJAX.

(2) (Regulatory Impact Analysis) See healthcare IT.
References in periodicals archive ?
Historians claim the harbour is a drowned river valley, formed when rising seas broke through a chalk ridge that connected to The Needles in the Isle of Wight.
Even in the south you've got areas of topography that differ dramatically, from the Cleddau estuary with its mudflats and drowned river valleys to the exposed Angle and Castlemartin peninsula and its large fields.