When people had ice boxes, where did the ice come from?

This is a great question, one that I remember asking my parents.  The blocks of ice came from lakes and ponds that were frozen in winter.  There were special horse-drawn cutters to slice the ice into blocks that would fit into an icebox, not too small, since a small block would melt quickly.  The ice was stored in ice houses, insulated with hay, and it lasted a remarkably long time that way. The blocks were delivered to people's homes. In my city, part of the history center was originally a ice house, an enormous building that outlived its usefulness for that purpose, previously owed by the Chautauqua Lake Ice Company, which got its ice, as you can guess, from Chautauqua Lake, in New York, which is quite cold in the winter.