How do you associate a lead with a territory?

How do you associate a lead with a territory?

Hi guys,
I don't see an option to associate a lead with a territory. There are options for contacts, accounts and potentials but not for leads. Is there a rationale behind this? 

I also note that there is no capacity to mass assign Contacts or Potentials to a territory, only Accounts. I understand that generally a Contact/Potential would be linked to an Account but what do you do if the client has already imported in a bunch of contacts without a territory?

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