noun
eastern limit; eastern boundary
Technical term used in biogeography and ecology for the easternmost limit of a species' distribution. Often contrasted with 西限 (western limit).
この植物の東限は関東地方とされている。
The eastern limit of this plant is considered to be the Kanto region.
分布の東限と西限を地図上に示した。
The eastern and western limits of the distribution were shown on a map.
Compound of 東 (east) and 限 (limit, boundary). A straightforward technical coinage.