highlands• the Andean highlands• In parts of the SouthernProvince and centralhighlands they were little used, and human power was employed instead.• Coffee was introduced into the central highlands in the 1840s, and quickly became the most important cashcrop.• There were no tractors or radios in the Hmong highlands until the 1950s.• The scene was reminiscent of the lunarhighlands.• An important minority of the population lives in far flung, sparsely populated areas such as the highlands and islands.• The maria and small plains in the highlands can readily be seen to postdate the craters on their borders.• The marebasins have dark, rather smooth floors that lie well below the altitude of the highlands.