"herumreisen" could also be used in colloquial language for traveling a lot. "Er ist das ganze Jahr über am herumreisen"

* reisen: the general word for "travel".
* verreisen: to go on a journey, or to go away; very commonly in the form "Er ist verreist" = "He's away/out of town, and for that reason unavailable".
* bereisen: to visit, to travel around a specific place; e.g. "Deutschland bereisen" would mean doing a tour of Germany, or at least visiting Germany. This verb needs an object: you have to say what country or area you are travelling in or through.
* herumreisen: this would mean travelling about, probably aimlessly.

Someone has asked this before but the comment containing the explanation has been deleted.

What are the differences between reisen, verreisen, bereisen and herumreisen? When do you use them?