From the 2010 FRC Competition Wikipedia Page:
Robots play Breakaway on a 27 by 54-foot rectangular field known as the field. The field is bordered by a set of guardrails and alliance walls. There are two “bumps” in the field that divide it into three zones. During matches, the robots are controlled from alliance stations located outside the field at both ends. These rectangular zones consist of three-team player stations that provide connectivity between the controls used by the robot operators and the arena. Goals are located at the corners of the field, and extend behind the alliance wall and adjacent to the player stations. After goals are scored, human players must pick up the balls and pass them to the center of the alliance station to be placed on a ball return rack, after which they will re-enter play at midfield. Teams are penalized if balls are not re-entered within a set time limit.