THE GUYANA BOUNDARY

The boundary of the Colony Of British Guiana commences at high water mark at the mouth of the Courentyne River which, by International Commission, has been fixed at Plantation No.61, Courentyne Coast, 39 miles from New Amsterdam and extends thence up the left bank of the Courentyne River, at high water mark, to its source, thence along the watershed between the Rivers Courentyne and Amazon to the source of the Essequibo River, thence along the watershed of the Rivers Essequibo and Branco to the source of the Takutu River, thence along the thalweg of the Takutu River to the mouth of the Ireng River thence up the thalweg of the Ireng River to its source , thence along the watershed of the Rivers Branco and Essequibo to the summit of Mount Roraima, thence in a straight line to the source of the Wenamu River, thence down the midstream of the Wenamu River to the Cuyuni River, thence down the thalweg of the Cuyuni River to the mouth of the Akarabisi River, thence up the midstream of the Akarabisi River to its source, thence along the watershed of the Barama and Cuyuni Rivers, Barima and Cuyuni Rivers, and Barima and Aguirie Rivers to the source of the Amakura River, thence down the midstream of the Amakura River to the mouth of the Haiowa Creek thence in a straight line to the source of the Muruma Creek, thence down the midstream of the Muruma Creek to its mouth, thence in a straight line to the coast at Punta Playa.

N.B.
- The thalweg of a river is its deepest channel and is not necessarily the midstream.
- The local definition of a river is any stream approximately 10 miles or more in length.

From the preface to "Where Is It?" By Vincent Roth - Georgetown, July 1938

Find the borders on this map of Guyana

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