About

Grindstone Island, the second largest island in the US section of the Thousand Islands, is nestled in the St. Lawrence River, north and northwest of Clayton, New York. This picturesque island is part of the municipality of Clayton, situated within Jefferson County in the state of New York. Its coordinates, 44°16’30″N 76°06’59″W, place it prominently within the famed archipelago that straddles the US-Canada border.

With its strategic location in the Thousand Islands region, Grindstone Island is a notable feature of this unique landscape. It lies within the “Two-Minute Box” of 44°18′ x 76°06′, marking it as a significant point of interest for those exploring the natural beauty and intricate waterways of the area. While the island does not have known alternate names, its presence adds to the rich tapestry of islands that define this internationally renowned area.

Island or Feature Name
Grindstone Island

Nationality
US

Centroid Lat/Long
441630N 0760659W

Two-Minute Box
44^18′ x 76^06′

Location and description
Second largest US Thousand Island, north and northwest of Clayton, NY

Former, informal, or alternate names

Municipality
Clayton

County
Jefferson

Province / State
NY

Ports?

Book refs
76^08′ x 44^18′; 76^06′ x 44^18′; 76^04′ x 44^18′

1000islands.co ID #
461

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Data source.