ambit
arena
bailiwick
beat
border
borderland
cerebral hemisphere
circle
circuit
demesne
department
domain
dominion
field
fifty percent
fifty-fifty
half
half-and-half
judicial circuit
jurisdiction
march
mediety
moiety
orb
orbit
pale
precinct
province
realm
round
semicircle
semiglobe
semisphere
sphere
walk
subfigure
archipelago
constellation
continent
cortex
crescent
disc
dome
expanse
extremity
firmament
flank
galaxy
globe
horizon
latitude
mainland
peninsula
prairie
quadrant
rectangle
rim
suburb