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"border" is also used as a crossword clue. If that's what you saw, the answer is often boundary (8 letters).
Definitions
lie adjacent to another or share a boundary
Word origin
Inherited from Middle English bordure, from Old French bordeure, of Germanic origin, from Frankish *bord, equivalent to modern French bord (“a border”) + -er.
Used in a sentence
“The border between Canada and USA is the longest in the world.”
“The Ministry of Defence said on Wednesday the men had been killed on Tuesday in the Nahr-e Saraj district of Helmand province, on the border of Kandahar just north of the provincial capital Lashkar Gah.”
“the borders of the garden”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer3 curated clues
01“Edge line”6 letters
02“Edge of a map”6 letters
03“Line between countries”6 letters
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