iven in full:

"The boundary line between the two republics shall commence in the
Gulf of Mexico, three leagues from land, opposite the mouth of the
Rio Grande, otherwise called Rio Bravo del Norte, or opposite the
mouth of its deepest branch, if it should have more than one branch
emptying directly into the sea; from thence up the middle of that
river, following the deepest channel, where it has more than one, to
the point where it strikes the southern boundary of New Mexico;
thence westwardly along the southern boundary of New Mexico (which
runs north of the town called Paso) to its western termination;
thence northward along the western line of New Mexico until it
intersects the first branch of the Rio Gila (or if it should not
intersect any branch of that river, then to a point on said line
nearest to said branch, and thence in a direct line to the same);
thence down the middle of the said branch of said river until it
empties into the Rio Colorado; thence across the Rio Colorado,
following the division line between Upper and Lower California to
the Pacific Ocean. The southern and western limits of New Mexico
mentioned in this article are those laid down in the map entitled
'_Map of the United Mexican States, as organized and defined by
various acts of Congress of said republic, and constructed according
to the best authorities. Revised edition. Published in New York, in
1847, by J. Disturnell_'; of which map a copy is added to this
treaty, bearing the signatures and seals of the undersigned
plenipotentiaries. And in order to preclude all difficulty in
tracing upon the ground limit separating Upper from Lower
California, it is agreed that the said limit shall consist of a
straight line drawn from the middle of the Rio Gila, where it unites
with the Colorado, to a point on the coast of the Pacific Ocean
distant one marine league due south of the southernmost point of the
port of San Diego, according to the plan of said port made in 1782
by Don Juan Pantoja, second sailing master of the Spanish fleet,
and published at Madrid in the year 1802, in the atlas to the voyage
of said schooners Sutil and Mexicana; of which plan a copy is
hereunto added, signed and sealed by the respective
plenipotentiaries.

"In order to designate the boundary line with due precision upon
authoritative maps, and to establish upon the ground landmarks which
shall sh