equator in the map of earth
nations or territories that touch the equator (red) or the prime meridian
the equator of a rotating spheroid (such as a planet) is the parallel (circle of latitude) at which latitude is defined to be 0°. it is the imaginary line on the spheroid, equidistant from its poles, dividing it into northern and southern hemispheres. in other words, it is the intersection of the spheroid with the plane perpendicular to its axis of rotation and midway between its geographical poles.
on earth, the equator is about 40,075 km (24,901 mi) long, of which 78.8% lies across water and 21.3% over land. indonesia is the country straddling the greatest length of the equatorial line across both land and sea.