• Safe core (Lumbridge & around) - always safe.
• Contested frontier (town borders, west & east) - PvP on, but capped at level 10.
• Main wilderness - north of the core, getting deeper (and higher level) the further you go (up to ~56).
• East Lumbridge PK pocket - an isolated single-combat duel spot, no level cap.

Rules of engagement: attacking first skulls you (30 min) and drops your loot penalty to −25%. On death you drop everything except your 3 most valuable items (prayer/magic gear is auto-kept). Single-combat zones are 1v1; multi zones allow piling. Your combat level ± the wilderness level sets who can attack you.