Arm of the sea

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ARM OF THE SEA. Lord Coke defines an arm of the sea to be where the sea or tide flows or reflows. Constable's Case, 5 Co. 107. This term includes bays, roads, creeks, coves, ports, and rivers where the water flows and reflows, whether it be salt or fresh. Ang. Tide Wat. 61. Vide Creek; Haven; Navigable; Port; Reliction; River; Road.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
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We landed at a small port-town called Xamoschi, situated on the south-east part of Japan; the town lies on the western point, where there is a narrow strait leading northward into along arm of the sea, upon the north-west part of which, Yedo, the metropolis, stands.
Once Granet paused to look down at the long arm of the sea on his left.
The Golden Horn is a narrow arm of the sea, which branches from the Bosporus (a sort of broad river which connects the Marmora and Black Seas,) and, curving around, divides the city in the middle.
I remember thinking how comfortable it was, this division of labour which made it unnecessary for me to study fogs, winds, tides, and navigation, in order to visit my friend who lived across an arm of the sea. It was good that men should be specialists, I mused.
Bu in this case, independently of the insignificance of such a agency, good reasons can be assigned for believing that thi valley was formerly occupied by an arm of the sea. It i needless in this work to detail the arguments leading to thi conclusion, derived from the form and the nature of th step-formed terraces on both sides of the valley, from th manner in which the bottom of the valley near the Ande expands into a great estuary-like plain with sand-hillock on it, and from the occurrence of a few sea-shells lying i the bed of the river.
(The Iloilo River while so named is an estuary or an arm of the sea where freshwater and seawater mix.)
The Pwllheli arm of the Sea Cadets are at risk of going under
the Hudson is actually an estuary, an arm of the sea, its surface raised and lowered by the tide twice a day.
An arm of the sea cuts halfway into the circle from the west.