Berry

Berries are common ingredient items scattered throughout the world, but more commonly found in the wild. They are the building blocks of many potions as well as ingredients for more advanced potions, such as Pulp.

Red Berry
Red Berries can be found while looking around in The Forest as well as the Track. They can be used as such or turned into Red Pulp to craft some common potions.

Yellow Berry
Berry (Yellow) can be found by searching the Cottage in the Forest. (If you haven't found the cottage yet, keep searching the Forest and talking to the Shopkeeper in town.)

Green Berry
Berry (Green) is found by looking around the Forest and the Swamp.

Blue Berry
Berry (Blue) can be found by searching the Swamp.

White Berry
Berry (White) can be found by searching the Forest Path. These are also sold by the Witch in the Witch's Hut.

Black Berry
Berry (Black) is sold by the Witch in the Witch's Hut. (see above. Drop location currently unknown.)

Editor's Note: I've only been playing for a few hours, but these are the common drop areas I've noticed. There may be other areas as well.