Kitamatsuura Peninsula has many bays, inlets, and other coastal features along its shores.
Imari Bay is located on the north, the
Hirado Strait is located to the west between
Hirado Island and the peninsula, and Sasebo Bay is found on the southwest. The peninsula is mainly
basalt which forms a gently-sloping
tableland and
pediment, though it features many small hills and uneven terrain as well. The borders of the tableland are very steep. There is abundant evidence of ancient landslide activity throughout the peninsula. Much of the land is covered in
rice fields, irrigated largely by abundant
reservoirs. Within the
stratum laid down during the
Tertiary period, abundant
coal deposits are found. These resources were developed following
World War II, creating
rapid economic growth in the Hokushō Region. However,
alternative energy activism has led to the closure of many of the mines in the area. The coastline of Kitamatsuura Peninsula is constantly changing due to erosion from the wind, rain, and ocean waves. The western area of the peninsula is a very wide and flat
drowned river valley filled with many small islands including the
Kujūku Islands. Much of the area is part of
Saikai National Park. The coastal area between
Tabira and
Matsuura is designated the . and are located on the north side of the peninsula. Due to the rugged coastline, the
fishing industry is very active on Kitamatsuura Peninsula. Tsukinokawa Port in Matsuura hosts a
fish market and handles the largest volume in Japan of
Japanese jack mackerel and
related fish. ==Municipalities==