IPA: /kənˈtɜːrmɪnəsli/
KK: /kənˈtɜːrmɪnəsli/
In a way that shares a boundary or is adjacent to something else.
The two countries are conterminously located, sharing a long border.
Conterminously → It is formed from "con-" (meaning together) and "terminus" (from Latin, meaning boundary or limit) and the suffix "-ly" (meaning in a manner). The word describes something that exists or occurs together at the same boundary or limit.
Think of things that are 'together' ('con-') at the same 'boundary' ('terminus') — that's what conterminously means.