Honshu the economy along the northwestern Sea of Japan coast is largely based on fishing and agriculture. The island is linked to the other three major Japanese islands by a number of bridges and tunnels. Its climate is humid and mild. The island is roughly long and ranges from wide, and its total area is , 60% of the total area of Japan, making it slightly larger than Great Britain. Its land area has been increasing with land reclamation and coastal uplift in the north, but global sea level rise has diminished these effects. Honshu has of coastline. Mountainous and volcanic,
Tuyên Quang Province its left bank. The province has a land area . The province's territory has only 7.2% of natural forest comprising both rain forest and monsoon forest. The distribution of river and stream network in the province is 0.98 km/km. There are three main rivers: Lô, Gâm and Pho Day. The Lô River originates in Van Nam, China, flows through Hà Giang to this province; it flows for a length of in the province and drains an area of . Its maximum flow is 11,700 m/s, while the minimum flow recorded is 128 m/s. It is a navigable river and is