it also travels past the east coast of the united states tow

介词,后跟宾语,the east coast of the united states towards easten canada,
再问： towards easten canada,这个是介词短语做状语吗，修饰的是travel？
再答： 对，我认为修饰的是travel. 它也经过了美国的东海岸朝向加拿大东部驶去。