The island is sharply divided into a northern limestone plateau with a general elevation of about 500 feet (150 metres) and a higher area of volcanic hills to the south.
The plateau is covered with a thick growth of jungle, while the volcanic hills support mainly sword grass.
The hills rise to an elevation of more than 1,000 feet (300 metres); their lower slopes to the east (and also, in part, to the west) are covered with younger limestones, generally similar to those of the northern limestone plateau.
The island rises to 1,332 feet (406 metres) at Mount Lamlam, in the southwest.
To the southeast of Mount Lamlam is another major hill, Mount Bolanos (1,240 feet [378 metres]).
Chamorros and other Micronesians constitute about half the population.
About three-fourths of the people are Roman Catholic, and one-eighth are Protestant.
Last Updated on 2 years by pinc