Along with other encomiums, the author of Hebrew called ‘the land of the promise’ (11:9) ‘a heavenly [one].’  This does not mean it is not on earth any more than the ’shares in [the] heavenly calling’ (3:1) who had ‘tasted the heavenly gift’ were not those who lived on earth.  Indeed, it was the very land on which the patriarchs dwelt as ’strangers and wanderers’ (11:13), but the expression means that it is a divine land which God himself has promised.

The Anchor Bible, “To the Hebrews,” p 192.