To be fair, Germany is fairly small (by US/China) standards.
The continental US (no Alaska or Hawaii) is > 22.5 times as big as Germany but has only 8.8 times as many miles of "navigable waterways." (However, it's not clear if the US numbers include the Great Lakes or the oceans; LA to Seattle and Miami to NYC goes by ocean, not some river.)
But, that doesn't leave much for the rest of Europe.
The continental US (no Alaska or Hawaii) is > 22.5 times as big as Germany but has only 8.8 times as many miles of "navigable waterways." (However, it's not clear if the US numbers include the Great Lakes or the oceans; LA to Seattle and Miami to NYC goes by ocean, not some river.)
But, that doesn't leave much for the rest of Europe.