er parts of Cuba.

In the province of Oriente, the various mountain groups form two
marginal ranges, which merge in the east, and diverge toward the west.
The southern range is far more continuous, while the northern is
composed of irregular groups separated by numerous river valleys.
Between these divergent ranges lies the broad undulating plain of the
famous Cauto Valley, which increases in width as it extends westward.
The northern half of this valley merges into the plains of Camaguey,
whose surface has been disturbed by volcanic uplifts only by a small
group known as the Najassa Hills, in the southeast center of the
province, and by the Sierra Cubitas Range, which parallels the coast
from the basin of Nuevitas Bay until it terminates in the isolated hill
known as Loma Cunagua.

The central mountainous region of the island is located in the province
of Santa Clara, where a belt of mountains and hills following
approximately northeast and southwest lines, passes through the cities
of Sancti Spiritus and Santa Clara. Four groups are found here, one of
which lies southwest of Sancti Spiritus and east of the Rio Agabama. A
second group is included between the valleys of the Agabama and the Rio
Arimao.

The highest peak of Santa Clara is known as Potrerillo, located seven
miles north of Trinidad, with an altitude of 2,900 feet. A third group
lies southeast of the city of Santa Clara, and includes the Sierra del
Escambray and the Alta de Agabama. The rounded hills of this region have
an altitude of about 1,000 feet although a few of the summits are
somewhat higher.

The fourth group consists of a line of hills, beginning 25 miles east of
Sagua la Grande, and extending into the province of Camaguey. The trend
of this range is transverse with the general geological structure of the
region.

East of the city of Santa Clara the hills of this last group merge with
those of the central portion of the province. The summits in the
northern line reach an altitude of only a thousand feet. The principal
members are known as the Sierra Morena, west of Sagua la Grande, Lomas
de Santa Fe, near Camaguini, the Sierra de Bamburanao, near Yaguajay,
and the Lomas of the Savanas, south of the last mentioned town.

In the province of Pinar del Rio, we find another system, or chain of
mountains, dominated by the Sierra de los Organos or Organ mountains.
These begin a little west of Guardiana Bay, with a chain of "magotes"
known as the