It's an historic day for the region as five border councils have been meeting in the first ever Borderlands Summit.
They're discussing how they cam boost economic growth by cooperating more in the future.
Tim Backshall sent us this report from Peebles:
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Showers turning heavy with a risk of thunder. Dry and bright start on Sunday, cloudy and wet from the west later
Scotland's First Minister said her government will seek 'immediate discussions' with Brussels to "protect Scotland's place in the EU".
The historic site is staging a dramatic re-enactment of the Jacobite siege in 1745.