geographical region vs drainage basin

Other hyponyms of geographical region include soil, territory, colony, dependency, semidesert, narco-state, place, property, basin, catchment area, catchment basin, drainage area, river basin, watershed, environs, purlieu, geographical zone, zone, environment, environs, surround, surroundings, dust bowl, hemisphere, flashpoint, hot spot, hotspot, trouble spot, panhandle, country, rural area, sphere, sphere of influence, field, settlement, parcel, parcel of land, piece of ground, piece of land, tract, populated area, urban area, wild, wilderness, killing field, northern Europe, French region, Baltic Republic, Baltic State, Colony, Dar al-Islam, House of Islam, Dar al-harb, House of War.