also: ドリネ
noun
doline; sinkhole
Geological term for a closed depression in karst terrain, formed by dissolution of limestone or other soluble rocks. Used in earth science contexts.
from German Doline
カルスト地形にはドリーネがよく見られる。
Dolines are often seen in karst landscapes.
この地域のドリーネは地下水の浸食でできた。
The dolines in this area were formed by groundwater erosion.