On 08/06/2021 16:06, David Batho wrote:
> I understood they used a large part of it to fill in the land (swamp?) on which Spencer Street Station was built. Did I get it wrong?!


You are correct - much of the land west and north of Spencer St was swampy.

See:
https://en.wikipedia.org/wiki/Batman%27s_Hill#/media/File:Batmans_hill_1840_and_1892.jpg