Pembwe and the Southeast
As with the rest of Tanzania, Swahili is the main language spoken, however you may come across tribal dialects such as Makonde or a mish mash of the two. English is spoken sporadically, tourists are rare in these parts so there has not been an incentive for people to learn foreign languages.
Dar-es-Salaam is the main port of entry for most visitors to not just the region, but to the country as a whole, be it by boat or by plane.
Basic buses run between all the major towns in the area and smaller dala dalas (minibuses) run between villages with good road access.