<Tr> <Td> Download coordinates as: KML GPX </Td> </Tr> <P> Article 3 of the treaty states: </P> <P> The Boundary Line between the two Countries, West of the Mississippi, shall begin on the Gulf of Mexico, at the mouth of the River Sabine in the Sea (29 ° 40 ′ 42" N 93 ° 50 ′ 03" W ﻿ / ﻿ 29.67822 ° N 93.83430 ° W ﻿ / 29.67822; - 93.83430 ﻿ (Sabine Pass)), continuing North, along the Western Bank of that River, to the 32d degree of Latitude (32 ° 00 ′ 00" N 94 ° 02 ′ 45" W ﻿ / ﻿ 32 ° N 94.04574 ° W ﻿ / 32; - 94.04574 ﻿ (Sabine River at 32 ° N)); thence by a Line due North to the degree of Latitude, where it strikes the Rio Roxo of Nachitoches, or Red - River (33 ° 33 ′ 04" N 94 ° 02 ′ 45" W ﻿ / ﻿ 33.55112 ° N 94.04574 ° W ﻿ / 33.55112; - 94.04574 ﻿ (Red River at 94 ° 2 ′ 45 "W)), then following the course of the Rio - Roxo Westward to the degree of Longitude, 100 West from London and 23 from Washington (34 ° 33 ′ 37" N 100 ° 00 ′ 00" W ﻿ / ﻿ 34.56038 ° N 100 ° W ﻿ / 34.56038; - 100 ﻿ (Red River at 100 ° W)), then crossing the said Red - River, and running thence by a Line due North to the River Arkansas (37 ° 44 ′ 38" N 100 ° 00 ′ 00" W ﻿ / ﻿ 37.74375 ° N 100 ° W ﻿ / 37.74375; - 100 ﻿ (Arkansas River at 100 ° W)), thence, following the Course of the Southern bank of the Arkansas to its source in Latitude, 42 . North and thence by that parallel of Latitude to the South - Sea (Pacific Ocean). The whole being as laid down in Melishe's Map of the United States, published at Philadelphia, improved to the first of January 1818 . But if the Source of the Arkansas River shall be found to fall North or South of Latitude 42, then the Line shall run from the said Source (39 ° 15 ′ 30" N 106 ° 20 ′ 38" W ﻿ / ﻿ 39.2583225 ° N 106.3439141 ° W ﻿ / 39.2583225; - 106.3439141 ﻿ (Arkansas River source)) due South or North, as the case may be, till it meets the said Parallel of Latitude 42 (42 ° 00 ′ 00" N 106 ° 20 ′ 38" W ﻿ / ﻿ 42 ° N 106.3439141 ° W ﻿ / 42; - 106.3439141 ﻿ (42 ° N 106 ° 20 ′ 38" W)), and thence along the said Parallel to the South Sea (42 ° 00 ′ 00" N 124 ° 12 ′ 46" W ﻿ / ﻿ 42 ° N 124.21266 ° W ﻿ / 42; - 124.21266 ﻿ (Pacific Coast at 42 ° N)). </P> <P> At the time the treaty was signed, the course of the Sabine River, Red River, and Arkansas River had only been partially charted . Furthermore, the rivers changed course periodically . It would take many years before the location of the border would be fully determined . </P>

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