Here are the areas you can get them and what % they appear:
* Greenwood Marsh - 25%
* Greenwood Shore - 20%
* Greenwood Woods - 25%
* Greenvale Fields - 20%
* Greenvale River - 20%
* Greenvale Woods - 20%
* Mistmarsh Lake - 20%
* Mistmarsh River - 25%
* Mount Snowpeak - 20%
* Mystic Marshes - 25%
* Mystic Woods - 25%
* Overlook Cliff - 25%
* Overlook Forest - 20%
* Overlook Shore - 25%
* Overlook Valley - 25%
* Starry Sky - 20%
* Starry Swamp - 20%
* Starry Woods - 25%
* Sunlit Grove - 25%
* Sunlit Marsh - 20%
* Sunlit Woods - 20%
* Sylvean Vale - 20%
* Sylvean Woodlands - 25%
* Thunder Cliffs - 25%
* Thunder Plains - 20%
* Twin Lakes - 25%