domain; sphere; field; territory; area

sea area; territorial waters; maritime space

waters; body of water

area; district; region

field; region; area; domain (taxonomy)

river basin; valley; drainage area

vocal range; register (music)

foreign country; alien land

(math.) codomain

image (or range) of a function (math.)

the entire area; the entire domain; global; domain-wide

county

field of fractions (math.)

territory; domain; realm; state; condition; situation; circumstances

subfield (math.)

number field (math.); subfield of the field of complex numbers

integral domain (abstract algebra)

(formal) boundary; scope

territory

airspace

a faraway and hard-to-reach land (classical)

color gamut

Western Regions (Han Dynasty term for regions beyond Yumen Pass 玉門關|玉门关[Yu4 men2 Guan1])

(linguistics) linguistic field; register

(Tw) (quantum mechanics) orbital

(math.) neighborhood (in a topological space)

closed domain; algebraically closed field (math.), e.g. complex number field 複數域|复数域[fu4 shu4 yu4]

(math.) codomain

(computing) scope

field of complex numbers (math.), usually denoted by C

domain (math.)

abstract field (math.)

interdisciplinary

Mesopotamia

algebraic number field (math.)

field of rational numbers (math.), usually denoted by Q

research area; field of research

administrative area

Changjiang or Yangtze river basin

the Yellow River basin

(computing) global scope

(computing) local scope

Murray-Darling river system in the southeast of Australia

Greater Mekong Subregion (GMS), area of economic cooperation between China and Vietnam