San Francisco owes its growth as a city to the fact that the Bay provides a connection between the Sierras (and their goldfields) and the Pacific Ocean.
Regarding Boston, the interesting thing is that it used to be connected to the Merrimack via the Middlesex Canal. My understanding is that this is silted up now (which you presumably already know) but it shows how many more connections we used to have.
Regarding Boston, the interesting thing is that it used to be connected to the Merrimack via the Middlesex Canal. My understanding is that this is silted up now (which you presumably already know) but it shows how many more connections we used to have.