predetermined area where cut branches or wood sections will be dropped or lowered from a tree (see landing zone).

Merriam-Webster Online Dictionary
drop zone (noun)
the area in which troops, supplies, or equipment are to be air-dropped , also the target on which a skydiver lands
drop zone (Wikipedia)

A drop zone (DZ) is a place where parachutists or parachuted supplies land. It can be an area targeted for landing by paratroopers and airborne forces, or a base from which recreational parachutists and skydivers take off in aircraft and land under parachutes. In the latter case, it is often beside a small airport, frequently sharing the facility with other general aviation.

Drop zone in Skydive Empuriabrava, Catalonia, Spain

At recreational drop zones, an area is generally set side for parachute landings. Personnel at the site may include a drop zone operator or owner (DZO), manifestors (who maintain the flight manifest documents defining who flies and when), pilots, instructors or coaches, camera operators, parachute packers and riggers, and other general staff.

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