This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A landmark visible from the sea, used as a guide in navigation.

n. Any elevated object on land which serves as a guide to mariners, such as a hill or steeple.

n. A beacon, buoy, etc. placed in the sea to aid navigation.

n. Any elevated object on land which serves as a guide to mariners; a beacon; a landmark visible from the sea, as a hill, a tree, a steeple, or the like.

n. Any elevated object on land which serves for a direction to mariners in entering a harbor, or in sailing along or approaching a coast; a beacon, as a light-house, a mountain, etc.

"Onward they sailed along the south bank of the estuary, past the great sea-carved stone arches of “Île Percée” that made it an important seamark."

beacon   

north-westernmost    headline    palm-shaded    seagirt    desart    palmy    eastermost    thalassic    colonizer    disunionist