群雄割拠
gun.yuu.ka-.kkyo

Literally: group – masculine/hero/leader – divide – basis

Alternately: Many rival warlords, each controlling their own territory and vying for supremacy. A given field seeing multiple people of great ability, influence, or power – possibly competing for dominance. A time of heroes and leaders.

Warring States era Japan with important demesnes marked. Brought to you courtesy of this economic conspiracy-theory blog, of all things.