Explanation:

Transhumance is a type of nomadism or pastoralism, a seasonal movement of people with their livestock between fixed summer and winter pastures.
Traditional or fixed transhumance occurs or has occurred throughout the inhabited world, particularly Europe and western Asia. It is often of high importance to pastoralist societies, as the dairy products of transhumance flocks and herds (milk, butter, yogurt and cheese) often form much of the diet of such populations. In many languages there are words for the higher summer pastures, and frequently these words have been used as place names: e.g. Hafod in Wales.