Border vs. boundary

[Ana]

English Grammar Error, Intermediate level

ESL/EFL Test #21 "Modal Verbs", question 4

In order to save money householders are asked to leave their dustbins at the border of their gardens.

(a) save
(b) householders
(c) border

English Grammar Error, Intermediate level

ESL/EFL Test #21 "Modal Verbs", answer 4

In order to save money householders are asked to leave their dustbins at the boundary of their gardens.

Correct entry: boundary
The error was: (c) border
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I'd like to kown the correct answer

Ana

[Alan]

Hi Ana,

Border is often the line between one country and another. A boundary (which is the word you need here) is the line around your house and garden.

Alan
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English as a Second Language
You can read my ESL story Briefly

[Mister Micawber]

.
You might have been confused by the word garden, Ana, which in BrE is a synonym for the property appertaining to one's house; in other Englishes, a garden is a part of the property which is used to grow flowers or vegetables, and these gardens have borders.
.
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Native English teacher at Mister Micawber's

[Alan]

Hi,

In British English, too gardens have borders and I am confused about this comment: