Touchdown zone | The Wise Pilot

The first 3,000 feet of the runway or the first third of the runway, whichever is less, measured from the threshold in the direction of landing.

Glossary: Runway Lights
Aeronautical ground lights located on a runway, indicating its direction or boundaries, and including but not limited to runway centreline lights, runway edge lights, runway end lights, threshold lights and touchdown zone lights.
Glossary: Touchdown Zone Elevation
The highest centreline elevation in the touchdown zone.