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Longman Dictionary of Contemporary English
penalty area
noun
EXAMPLES FROM CORPUS
▪ Baltusnikas shot wide, scarcely believing he had so much room in the Republic's penalty area.
▪ Five minutes before the break, Jan Molby's pass gave Rob Jones a chance on the edge of the penalty area.
▪ He was pacing the floor when Dannie Bulman spun a deep cross into the Leicester penalty area.
▪ Matt Elliott gave the ball away and Niall Quinn found space just outside the penalty area.
▪ McCoist's header fell invitingly to Hateley, who was lurking on the edge of the Leeds penalty area.
▪ Ryan Giggs dribbled into the penalty area, beat Andy Griffin once, then went down under a second challenge.
▪ Strachan got the goal, another well-crafted and well-taken strike running into the penalty area from Speed's pass.
▪ Williams fouled Hendrie just outside the penalty area on the Middlesbrough left.
Wiktionary
penalty area

n. (context football English) An area of a soccer pitch extending 18 yards out of the goal, inside which a penalty is given to the offensive team if a foul is made by the defensive team.

Wikipedia
Penalty area

The penalty area or 18-yard box (also known less formally as "the penalty box" or simply "the box") is an area of an association football pitch. It is rectangular and extends 16.5m (18 yd) to each side of the goal and 16.5m (18 yd) in front of it. Within the penalty area is the penalty spot (or penalty mark), which is or 12 yards from the goal line, directly in-line with the centre of the goal. A penalty arc adjoins the penalty area, and encloses the area within 9.15m (10 yd) from the penalty spot; it does not form part of the penalty area and is only of relevance during the taking of a penalty kick.

Previously, penalty areas extended the width of the field, but were reduced to their current dimensions in 1901.