Upper Kurast is a surface area in Act 3. It is accessed through Kurast Bazaar or through its waypoint.
Upper Kurast belongs to the terror zone Kurast Bazaar, Lower Kurast, Upper Kurast, Kurast Causeway, Kurast Sewers, Ruined Temple, Disused Fane, Forgotten Reliquary, Forgotten Temple, Ruined Fane and Disused Reliquary. When it is terrorized in Hell, its monsters are 2 levels above your character, up to level 96, and give 25% more experience.
Upper Kurast has super chests in its temples and stone huts. A super chest looks like a normal chest and always spawns on the same tiles. It ignores treasure classes and magic find: a 16-bit seed picks one of 65,536 fixed drop patterns, with a separate set for locked chests. Drops are all magic (95%) or all rare (5%), and some patterns contain high runes. See Lower Kurast super chests.