Early travel to the region was mainly by ship, with overland transportation developing later. By the 1830s a steady stream of travelers entered Oregon from the south through California and from the east over the Rocky Mountains. Many of these people were involved with the fur trade and would use the well worn trails of the Native Americans. Travel overland was mainly by horse, mule, and foot until the later 1830s when wagons slowly worked their way into the region. The Oregon Trail began seeing mass migration involving wagon trains in 1843. Boats were used extensively to haul cargo in the region, including steamboats, with the SS Beaver as the first steamboat in Oregon.