noun
foothill; end section of a mountain range
Refers to a low hill at the base of a mountain or the lower, outer part of a mountain range.
その村は端山に囲まれている。
The village is surrounded by foothills.
山麓 refers specifically to the base or foot of a mountain, while 端山 can refer to the foothills as a geographical feature or the end section of a mountain range.
Compound of 端 (は, 'edge' or 'end') and 山 (やま, 'mountain').