Default
By default you get 49 claims when you place a townhall
*As long as it's small/reasonable you can have some huts that expand your border without following the territorial expansion rules (anything that gives you 100 additional claims or more is unreasonable)
Holding Additional Claims
1 warpoint gives you a additional 4 chunks you may hold
Ask Admin to expand your territory (territory may be expanded as much as you can hold)
Nation Warpoints
Nations can count warpoints of their citizens towards holding lands for their nation if those citizens aren't using those warpoints to hold their town claims
Overextended
Once you've claimed lands, if you stop having as much warpoints as you'd need to hold those lands...
You are overextended and could be forced to lose claimed lands should you be invaded