In December 2005's Waterways World, we looked for the world's deepest lock - and found it at Oskemen, in Kazakhstan. Here's how we described it:
Oskemen is on a resurgent river route from northern China to Russia. Its rise of 40m-42m (around 138ft) is seven times the deepest on the British canal system.
See full article at http://www.waterwaysworld.com/latest.cgi?month=012008&start=20