The center area is the middle of the goban, delimited by the edges and the corners.
The center point is called tengen.
See also :
Referenced byChineseGoTermsBoardGeographyUpAndDownHighVsLowPincerCornersThenSidesT...TengenCenterCornersSystematicJoseki44PriorityHighSystematicJoseki/...IntroductoryPages...