Describe the environment

If the leg of travel goes through unfamiliar terrain—an environment that the players have never seen before, or one that has changed significantly since the PCs last came through—then spend some time describing the environment.

Start with the obvious details: the nature of the terrain, its size and scale, the weather, and anything that they couldn't help but notice. Provide up to 3 impressions from different senses: things they see, hear, smell, or feel (physically or emotionally) as they travel. The Book II entries for each region include examples.

Keep your descriptions concise. Players will zone out if you give them too much detail, and they'll ask questions when they want or need more.

If the leg goes through familiar terrain an environment that the players have seen before—then just describe the current weather and maybe remind them what this terrain is like.