We may distinguish six kinds of terrain, to wit: (1) Accessible ground; (2) entangling ground; (3) temporising ground; (4) narrow passes; (5) precipitous heights; (6) positions at a great distance from the enemy.
Lionel Giles', Sun Tzu (1910). “Sun Tzu's Art of War - Illustrated & Translated for Modern Readers”, p.28, SJ Creations Tokyo
