The Kiel Canal as a warship draft constraint

Which major shipping canal has the shallowest draft and beam restrictions?

The Kiel Canal, at roughly 9.5 meters or 31 feet of maximum draft among the major canals discussed.

Kiel is the shallowest major shipping-canal constraint in the comparison, although smaller or obsolete waterways may be more restrictive. For a navy expected to shift ships between the North Sea and Baltic, that depth becomes a direct design input. Along with Panama, Suez, and dockyard access, the canal shows how infrastructure fixes the practical envelope of a warship.