noun which may take the genitive case particle 'no'
Used as a no-adjective to describe something in the process of development, such as an industry, town, or economy. Often appears in the compound 発展途上国 (developing country).
This region is still in a developing stage.
Support for developing countries is important.
発展途上 is the neutral, standard term for a country or region that is 'developing', while 未開発 stresses the lack of development and can sound more negative.
Compound of 発展 (development) and 途上 (on the way, in progress).