A lanship is a large vehicle that travels on land, as opposed to on water or in space where large vehicles are usually used. Because of their large size, their use on land is seen as impractical due to terrain obstacles, and soft ground that cannot support such large weight. Such problems are non-existent on water and in space. However, vehicles similar to the concept of landships have appeared in various forms in the real world, and more commonly in works of fiction.