The part of the field closest to the bases is called the infield, and the grassy farther reaches is called the outfield.The bases are 90 feet apart on the diamond, closer in childrens leagues and softball. Other fields are variable, and the outfield fences or the amount of foul territory the amount of ground that borders the field between the long white lines that connect first base to home plate and third base to home plate varies from field to field.