A great example of a physical boundary is a mountain. For example, the Pyrenees Mountains, which serve to separate France and Spain, are a physical boundary. So are the Ural Mountains which separate Europe and Asia. Along with mountains, oceans, seas, even deserts are examples of physical boundaries.
An average size apple weighs 6.4 ounces, which is equal to 180  grams. One apple contains approximately 91 calories and 3 grams of  dietary fiber.
A small, raw, unpeeled apple weighing just over 5 ounces provides 77 calories and 3.6 grams of fiber, an amount equivalent to about 14 percent of the daily value for fiber. Without skin, a small apple has 63 calories and just 1.7 grams of fiber, according to USDA data.