Urbanite (3.5e Flaw)
From D&D Wiki
While you may have travelled extensively at some point in your life, you always feel more at home in a large town or city. Wilderness life simply isn't for you.
Effect: You suffer a -4 penalty on all Knowledge (Nature) and Survival checks. If forced to camp outdoors in anything less substantial than a tent and bedroll, you have a 20% chance to awaken fatigued.