What is the meaning of Overland?

By or across land.

Over, across, or by land.

A trip by land between the UK and the Indian subcontinent or Australia, or between the UK and South Africa.

To transport (especially sheep or other farm animals) over land.

To travel across land.

To go on a recreational expedition to a remote destination, often with the aid of an off-road vehicle.

Source: wiktionary.org