lying between the Beni and the east and west boundary line
agreed upon by Spain and Portugal in 1750 and 1777, which is near the
7th parallel. With regard to the section between the Amazon and the
Apaporis river, already settled between Brazil and Peru, the territory
has been in protracted dispute between Peru, Ecuador and Colombia; but a
treaty of limits between Brazil and Ecuador was signed in 1901 and
promulgated in 1905. The boundary with Colombia, fixed by treaty of
April 24, 1907, follows the lower rim of the Amazon basin, as defined by
Brazil. The Colombian claim included the left bank of the Amazon
eastward to the Auahy or Avahy-parana channel between the Amazon and
Yapura, whence the line ran northward to the Negro near the intersection
of the 66th meridian. The Brazilian line ran north and north-west from
the mouth of the Apaporis to the 70th meridian, which was followed to
the water-parting south of the Uaupes basin, thence north-east to the
Uaupes river, which was crossed close to the 69th meridian, thence
easterly along the Serra Tunaji and Isana river to Cuyari, thence
northerly up the Cuyari and one of its small tributaries to the Serra
Capparro, and thence east and south-east along this range to the Cucuhy
rock (Pedra de Cucuhy) on the left bank of the Negro, where the
Colombian section ends. Negotiations for the settlement of this
controversy, which involved fully one-third of the state of Amazonas,
were broken off in 1870, but were resumed in 1905. The boundary with
Venezuela, which was defined by a treaty of 1859, runs south-eastward
from Cucuhy across a level country intersected by rivers and channels
tributary to both the Negro and Orinoco, to the Serra Cupuy watershed
which separates the rivers of the Amazon and Orinoco valleys. This
watershed includes the ranges running eastward and northward under the
names of Imeri, Tapiira-peco, Curupira, Parima and Pacaraima, the
Venezuelan section terminating at Mt. Roraima. On the 9th of December
1905 protocols were signed at Caracas accepting the line between Cucuhy
and the Serra Cupuy located in 1880, and referring the remainder, which
had been located by a Brazilian commission in 1882 and 1884, to a mixed
commission for verification.

The disputed boundary between Brazil and British Guiana, which involved
the possession of a territory having an estimated area of 12,741 sq. m.,
was settled by arbitration in 1904 with the king of Italy as arbitrator,
the a