What exactly is "greater difficult terrain"?

[Kainite101]

I see mention of it and the movement cost in the CRB under the terrain section, but no examples of it. I thought I recall seeing an effect or spell or something??? that mentioned it somehow turned an area into greater difficult, but for life of me can't find that either anymore... Any help pointing to page references would be most welcome of spells, abilities, or actual terrain references (like ice and snow on top of treacherous steep rocky slope...). My google-fu leads me in a circular pattern referencing the same section in CRB about terrain...

**EDIT** I have found several spells that let you avoid it, and only 1 spell(Punishing Winds) that mention it...

[shroudb]

there are several mentions/examples of it in the CRB:

Quote:

Light undergrowth is difficult terrain that allows a character to Take Cover, while heavy undergrowth is greater difficult terrain that provides cover automatically. Some sorts of undergrowth, such as thorns, are also hazardous terrain, and areas with plenty of twisting roots are uneven ground.

Quote:

Aquatic environments are among the most challenging for PCs short of other worlds and unusual planes. PCs in an aquatic environment need a way to breathe (typically a water breathing spell) and must usually Swim to move, though a PC who sinks to the bottom can walk awkwardly, using the rules for greater difficult terrain. Characters in aquatic environments make frequent use of the aquatic combat (page 478) and drowning and suffocation rules (page 478).

Quote:

Depending on the depth of snow and its composition, most snowy ground is either difficult terrain or greater difficult terrain. In denser snow, characters can attempt to walk along the surface without breaking through, but some patches might be loose or soft enough that they’re uneven ground.

Quote:

Also called mires, bogs are watery areas that accumulate peat, are covered by shrubs and moss, and sometimes feature floating islands of vegetation covering deeper pools. Shallow bogs are difficult terrain for a Medium creature, and deep bogs are greater difficult terrain. If a bog is deep enough that a creature can’t reach the bottom, the creature has to Swim. Bogs are also acidic, so particularly extreme or magical bogs can be hazardous terrain.

and quite a few more (ash, crowds, stalagmintes, hedges, some types of stairs, etc)

For page reference:
most of them are in the gamemastering section in the enviroment subsection.

[Kainite101]

Hmmm well so much for using the "find" option on my copy PDF... searched "greater difficult" and the only thing it flagged was the mention of it in the terrain section dealing with movement cost... Thank you.