Sand
Packed sand doesn't usually significantly impede a character's movement, but loose sand is either {rules 414 "difficult terrain"}} (if it's shallow) …
Packed sand doesn't usually significantly impede a character's movement, but loose sand is either {rules 414 "difficult terrain"}} (if it's shallow) or uneven ground (if it's deep). The wind often shifts sand into dunes, hills of loose sand with uneven ground facing the wind and steeper inclines away from the wind.
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