The use of different resources in different locations and exchanges with neighbouring groups require a high degree of mobility. To this end, the peoples of the North have developed appropriate methods of transport that are adapted to the rough terrain in both summer and winter. In summer, land transport is carried out with reindeer and horses, and in winter also with dog sleds. For transport on water, there are various types of boats suited to the different conditions of the open sea or rivers. With increasing mechanization since the mid-20th century, motorized transport has also become more widespread, such as snowmobiles, tracked vehicles (ATVs), and modern boat types.