Westlichste
Westlichste is the superlative form of the German adjective westlich, meaning "western." It is used to indicate the most western item within a defined group, such as places, parts of a country, or other collections. The word signals extreme position on the west side and is common in geographic descriptions, maps, and comparative statements.
In German, westlichste is typically used in attributive position before a noun and agrees with the noun
Westlichste can also appear in broader, non-literal uses to describe the most western aspect of a region
Etymology-wise, westlichste derives from westlich (western) with the superlative suffix -ste, a common pattern in German