Boso Peninsula (房総半島, bosohanto) is the south east side of Kanto area. The coastline faces Tokyo Bay called Uchi-bo(内房), and the coastline faces Pacific Ocean called Soto-bo (外房). Most of the cities are located along the coastline and middle part of Boso Peninsula is mostly mountain. Because access to Uchi-bo is very good from Tokyo, many people visit here for delicious local fish and hiking. Soto-Bo has the Kujukurihama (九十九里浜) Beach which is one of the longest beach in Japan. So in summer many people visit there for summer vacation.
Narita area is the north part of Chiba Prefecture, there are many important shrines and temples. Naritasan Shinshoji Temple is one of the most popular temples, especially famous for new year's worship. Katori Shrine is the oldest shrine and most important shrine for Japanese martial arts. Most of the Narita area are rice field but there are also many natures are still preserved well, and some of the cities like Sawara have old style building which gives you Edo style travel. Tone River, which is the longest river in Japan are located on the border of Ibaraki Prefecture, is also located in this area.