Use boundary and region in two sentences about ways of organizing the Western Hemisphere

In geographic and fashioning, the hemispheres of Earth talk over with any division of the world into 2 hemispheres. the foremost common such divisions square measure by angular distance or longitudinal markers:

North-South

Northern Hemisphere,

East-West

Eastern Hemisphere, the 0.5 that lies east of the line of longitude and west of the a hundred and eightieth meridian

Western Hemisphere, the 0.5 that lies west of the line of longitude and east of the a hundred and eightieth meridian.