territory

noun

1 the government was prepared to give up the nuclear weapons on its territory:

area of land, area, region, enclave;

country, state, land, dependency, colony, dominion, protectorate, fief, possession, holding;

domain, county, district, zone, sector, quarter;

soil;

archaic demesne.

2 mountainous territory:

terrain, land, tract of land, ground, countryside.

3 practically everyone else has been muscling in on my territory lately:

domain, area of concern/interest/knowledge, province, department, field, preserve, sphere, arena, realm, world;

informal bailiwick, turf.

4 a sales rep for a large territory:

sphere of operations, area, section, stomping ground;

haunts, purlieus;

informal turf;

British, informal patch, manor.