Glencorse is a parish of Midlothian, Scotland, lying 7 miles south of Edinburgh. It is bounded on the north-west by the former parish of Colinton now within the City of Edinburgh, to the north and west by Lasswade and to the south and west by Penicuik.

Lasswade is a village and civil parish in Midlothian, Scotland, on the River North Esk, nine miles south of Edinburgh city centre, contiguous with Bonnyrigg and between Dalkeith to the east and Loanhead to the west. Melville Castle lies to the north east. The Gaelic form is Leas Bhaid, meaning the "clump at the fort."