verb

keep or restrict someone or something within certain limits of (space, scope, or time).

he does not confine his message to high politics

enclose,incarcerate,imprison,intern,impound,hold captive,trap,shut in/up,keep,pen in/up,cage,lock in/up,coop (up),box up/in,immure,mew up,fence in,hedge in,hurdle,rail in,wall in/up,encircle,surround,ring,encompass,hem in,close in,kettle,corral,gird,compass,restrict,limit,keep within the limits of,not allow to go beyond

noun

the borders or boundaries of a place, especially with regard to their restricting freedom of movement.

within the confines of the hall escape was difficult

limits,outer limits,borders,boundaries,margins,extremities,edges,fringes,marches,periphery,perimeter,circumference,compass,precinct,pale