It was distinctly cool in Siberia in September 1994, but not cold enough to keep an Australian in the tour group from jumping into Lake Baikal.

It looks like he’s out in the middle of the lake, but we weren’t far from shore, on a small tour boat — seen here docked.

The Lake Baikal statistic that impressed me then, and still does, is its volume. It’s an enormous crack in the crust of the Earth, full of water. How much? 5,700 cubic miles. If that’s not impressive by itself, that’s more water than all of the Great Lakes combined.

Most of my pictures were from the shore.

I came away with the impression of a Great Lake, but with mountains off in the distance. Take Lake Superior, say, and move it eastern Colorado.